864652644 has 60 divisors (see below), whose sum is σ = 2265894400. Its totient is φ = 287513712.

The previous prime is 864652631. The next prime is 864652699. The reversal of 864652644 is 446256468.

864652644 is a `hidden beast` number, since 86 + 4 + 6 + 526 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 864652644.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 139197 + ... + 145275.

Almost surely, 2^864652644 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 864652644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1132947200).

864652644 is an abundant number, since it is smaller than the sum of its proper divisors (1401241756).

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

864652644 is a wasteful number, since it uses less digits than its factorization.

864652644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6534 (or 6523 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The square root of 864652644 is about 29404.9765175897. The cubic root of 864652644 is about 952.6803874363.

The spelling of 864652644 in words is "eight hundred sixty-four million, six hundred fifty-two thousand, six hundred forty-four".