864536508 has 72 divisors (see below), whose sum is σ = 2387513856. Its totient is φ = 261597600.

The previous prime is 864536507. The next prime is 864536509. The reversal of 864536508 is 805635468.

864536508 is a `hidden beast` number, since 8 + 64 + 536 + 50 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (864536507) and next prime (864536509).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864536507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 391335 + ... + 393537.

Almost surely, 2^864536508 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 864536508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1193756928).

864536508 is an abundant number, since it is smaller than the sum of its proper divisors (1522977348).

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

864536508 is a wasteful number, since it uses less digits than its factorization.

864536508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215 (or 3210 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 864536508 is about 29403.0016835016. The cubic root of 864536508 is about 952.6377323717.

The spelling of 864536508 in words is "eight hundred sixty-four million, five hundred thirty-six thousand, five hundred eight".