80686656 has 84 divisors (see below), whose sum is σ = 233306112. Its totient is φ = 26659584.

The previous prime is 80686609. The next prime is 80686657. The reversal of 80686656 is 65668608.

It is not an unprimeable number, because it can be changed into a prime (80686657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72601 + ... + 73703.

Almost surely, 2^80686656 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 80686656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116653056).

80686656 is an abundant number, since it is smaller than the sum of its proper divisors (152619456).

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

80686656 is a wasteful number, since it uses less digits than its factorization.

80686656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 1235 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 80686656 is about 8982.5751318873. The cubic root of 80686656 is about 432.1162238727.

The spelling of 80686656 in words is "eighty million, six hundred eighty-six thousand, six hundred fifty-six".