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BaseRepresentation
bin1000010110000…
…01110110000000
311212201100221121
410023001312000
5120410000000
610540202024
71506663430
oct413016600
9155640847
1070000000
1136571044
121b539314
131166b825
1494222c0
15622ab1a
hex42c1d80

70000000 has 128 divisors (see below), whose sum is σ = 199218240. Its totient is φ = 24000000.

The previous prime is 69999989. The next prime is 70000027. The reversal of 70000000 is 7.

It is a happy number.

It is a sliding number, since 70000000 = 20000000 + 50000000 and 1/20000000 + 1/50000000 = 0.000000070000000.

It is a tau number, because it is divible by the number of its divisors (128).

It is an ABA number since it can be written as A⋅BA, here for A=7, B=10.

It is a Harshad number since it is a multiple of its sum of digits (7).

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 15 ways as a sum of consecutive naturals, for example, 9999997 + ... + 10000003.

Almost surely, 270000000 is an apocalyptic number.

70000000 is a gapful number since it is divisible by the number (70) 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 70000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99609120).

70000000 is an abundant number, since it is smaller than the sum of its proper divisors (129218240).

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

70000000 is an frugal number, since it uses more digits than its factorization.

70000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56 (or 14 counting only the distinct ones).

The product of its (nonzero) digits is 7, while the sum is 7.

The square root of 70000000 is about 8366.6002653408. The cubic root of 70000000 is about 412.1285299809.

The spelling of 70000000 in words is "seventy million", and thus it is an aban number and an uban number.