86640564 has 24 divisors (see below), whose sum is σ = 204722560. Its totient is φ = 28514304.

The previous prime is 86640553. The next prime is 86640583. The reversal of 86640564 is 46504668.

It is a congruent number.

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, 44749 + ... + 46644.

Almost surely, 2^86640564 is an apocalyptic number.

It is an amenable number.

86640564 is an abundant number, since it is smaller than the sum of its proper divisors (118081996).

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

86640564 is a wasteful number, since it uses less digits than its factorization.

86640564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91479 (or 91477 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 86640564 is about 9308.0913188473. The cubic root of 86640564 is about 442.4936984005.

The spelling of 86640564 in words is "eighty-six million, six hundred forty thousand, five hundred sixty-four".