79655681 has 16 divisors (see below), whose sum is σ = 93477888. Its totient is φ = 66469200.

The previous prime is 79655669. The next prime is 79655707. The reversal of 79655681 is 18655697.

It is not a de Polignac number, because 79655681 - 2⁶ = 79655617 is a prime.

It is a super-2 number, since 2×79655681² = 12690055031147522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79655881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40286 + ... + 42216.

It is an arithmetic number, because the mean of its divisors is an integer number (5842368).

Almost surely, 2^79655681 is an apocalyptic number.

79655681 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

79655681 is a deficient number, since it is larger than the sum of its proper divisors (13822207).

79655681 is a wasteful number, since it uses less digits than its factorization.

79655681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092.

The product of its digits is 453600, while the sum is 47.

The square root of 79655681 is about 8925.0031372544. The cubic root of 79655681 is about 430.2678716721.

The spelling of 79655681 in words is "seventy-nine million, six hundred fifty-five thousand, six hundred eighty-one".