80918656 has 64 divisors (see below), whose sum is σ = 198434880. Its totient is φ = 32007168.

The previous prime is 80918641. The next prime is 80918683. The reversal of 80918656 is 65681908.

It is a tau number, because it is divible by the number of its divisors (64).

It is a nialpdrome in base 14.

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, 8175 + ... + 15121.

It is an arithmetic number, because the mean of its divisors is an integer number (3100545).

Almost surely, 2^80918656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80918656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99217440).

80918656 is an abundant number, since it is smaller than the sum of its proper divisors (117516224).

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

80918656 is a wasteful number, since it uses less digits than its factorization.

80918656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6981 (or 6969 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 80918656 is about 8995.4797537430. The cubic root of 80918656 is about 432.5299851130.

The spelling of 80918656 in words is "eighty million, nine hundred eighteen thousand, six hundred fifty-six".