86636979 has 64 divisors (see below), whose sum is σ = 158860800. Its totient is φ = 45878400.

The previous prime is 86636939. The next prime is 86636983. The reversal of 86636979 is 97963668.

It is a happy number.

It is not a de Polignac number, because 86636979 - 2⁹ = 86636467 is a prime.

It is a super-2 number, since 2×86636979² = 15011932260492882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86636939) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 72769 + ... + 73949.

It is an arithmetic number, because the mean of its divisors is an integer number (2482200).

Almost surely, 2^86636979 is an apocalyptic number.

86636979 is a deficient number, since it is larger than the sum of its proper divisors (72223821).

86636979 is a wasteful number, since it uses less digits than its factorization.

86636979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233 (or 1227 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 86636979 is about 9307.8987424660. The cubic root of 86636979 is about 442.4875951708.

The spelling of 86636979 in words is "eighty-six million, six hundred thirty-six thousand, nine hundred seventy-nine".