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80000000 = 21057
BaseRepresentation
bin1001100010010…
…11010000000000
312120112102100222
410301023100000
5130440000000
611534402212
71660663103
oct461132000
9176472328
1080000000
1141181203
1222960368
13137603a2
14a8a673a
157053a85
hex4c4b400

80000000 has 88 divisors (see below), whose sum is σ = 199901832. Its totient is φ = 32000000.

The previous prime is 79999987. The next prime is 80000023. The reversal of 80000000 is 8.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 4 ways, for example, as 79138816 + 861184 = 8896^2 + 928^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15999998 + ... + 16000002.

Almost surely, 280000000 is an apocalyptic number.

80000000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99950916).

80000000 is an abundant number, since it is smaller than the sum of its proper divisors (119901832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80000000 is an frugal number, since it uses more digits than its factorization.

80000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 80000000 is about 8944.2719099992. The cubic root of 80000000 is about 430.8869380064.

The spelling of 80000000 in words is "eighty million", and thus it is an aban number and an uban number.

Divisors: 1 2 4 5 8 10 16 20 25 32 40 50 64 80 100 125 128 160 200 250 256 320 400 500 512 625 640 800 1000 1024 1250 1280 1600 2000 2500 2560 3125 3200 4000 5000 5120 6250 6400 8000 10000 12500 12800 15625 16000 20000 25000 25600 31250 32000 40000 50000 62500 64000 78125 80000 100000 125000 128000 156250 160000 200000 250000 312500 320000 400000 500000 625000 640000 800000 1000000 1250000 1600000 2000000 2500000 3200000 4000000 5000000 8000000 10000000 16000000 20000000 40000000 80000000