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80990 = 2571389
BaseRepresentation
bin10011110001011110
311010002122
4103301132
510042430
61422542
7455060
oct236136
9133078
1080990
1155938
123aa52
132ab30
1421730
1518ee5
hex13c5e

80990 has 32 divisors (see below), whose sum is σ = 181440. Its totient is φ = 25344.

The previous prime is 80989. The next prime is 81001. The reversal of 80990 is 9908.

80990 = 112 + 122 + ... + 622.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 866 + ... + 954.

It is an arithmetic number, because the mean of its divisors is an integer number (5670).

280990 is an apocalyptic number.

80990 is an abundant number, since it is smaller than the sum of its proper divisors (100450).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90720).

80990 is a wasteful number, since it uses less digits than its factorization.

80990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 80990 is about 284.5874206637. The cubic root of 80990 is about 43.2657064809.

The spelling of 80990 in words is "eighty thousand, nine hundred ninety".

Divisors: 1 2 5 7 10 13 14 26 35 65 70 89 91 130 178 182 445 455 623 890 910 1157 1246 2314 3115 5785 6230 8099 11570 16198 40495 80990