80861664 has 48 divisors (see below), whose sum is σ = 228593232. Its totient is φ = 24880128.

The previous prime is 80861659. The next prime is 80861681. The reversal of 80861664 is 46616808.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (39).

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 7 ways as a sum of consecutive naturals, for example, 31149 + ... + 33644.

It is an arithmetic number, because the mean of its divisors is an integer number (4762359).

Almost surely, 2^80861664 is an apocalyptic number.

It is an amenable number.

80861664 is an abundant number, since it is smaller than the sum of its proper divisors (147731568).

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

80861664 is a wasteful number, since it uses less digits than its factorization.

80861664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64819 (or 64811 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 80861664 is about 8992.3113825089. The cubic root of 80861664 is about 432.4284158760.

The spelling of 80861664 in words is "eighty million, eight hundred sixty-one thousand, six hundred sixty-four".