88656921 has 24 divisors (see below), whose sum is σ = 139266504. Its totient is φ = 54120960.

The previous prime is 88656917. The next prime is 88656959. The reversal of 88656921 is 12965688.

88656921 is a `hidden beast` number, since 8 + 86 + 569 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 71318025 + 17338896 = 8445^2 + 4164^2 .

It is not a de Polignac number, because 88656921 - 2² = 88656917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (88656961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2170 + ... + 13491.

It is an arithmetic number, because the mean of its divisors is an integer number (5802771).

Almost surely, 2^88656921 is an apocalyptic number.

It is an amenable number.

88656921 is a deficient number, since it is larger than the sum of its proper divisors (50609583).

88656921 is a wasteful number, since it uses less digits than its factorization.

88656921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15721 (or 15718 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 88656921 is about 9415.7804243727. The cubic root of 88656921 is about 445.9000778248.

The spelling of 88656921 in words is "eighty-eight million, six hundred fifty-six thousand, nine hundred twenty-one".