80691660 has 96 divisors (see below), whose sum is σ = 286917120. Its totient is φ = 18442944.

The previous prime is 80691647. The next prime is 80691697. The reversal of 80691660 is 6619608.

It is a super-2 number, since 2×80691660² = 13022287987111200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6894 + ... + 14453.

It is an arithmetic number, because the mean of its divisors is an integer number (2988720).

Almost surely, 2^80691660 is an apocalyptic number.

It is an amenable number.

80691660 is an abundant number, since it is smaller than the sum of its proper divisors (206225460).

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

80691660 is a wasteful number, since it uses less digits than its factorization.

80691660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21372 (or 21364 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 80691660 is about 8982.8536668477. The cubic root of 80691660 is about 432.1251566380.

The spelling of 80691660 in words is "eighty million, six hundred ninety-one thousand, six hundred sixty".