864725920 has 24 divisors (see below), whose sum is σ = 2042915364. Its totient is φ = 345890304.

The previous prime is 864725903. The next prime is 864725971. The reversal of 864725920 is 29527468.

It can be written as a sum of positive squares in 2 ways, for example, as 850072336 + 14653584 = 29156^2 + 3828^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2702109 + ... + 2702428.

Almost surely, 2^864725920 is an apocalyptic number.

864725920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

864725920 is an abundant number, since it is smaller than the sum of its proper divisors (1178189444).

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

864725920 is a wasteful number, since it uses less digits than its factorization.

864725920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5404552 (or 5404544 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 864725920 is about 29406.2224707629. Note that the first 3 decimals coincide. The cubic root of 864725920 is about 952.7072986809.

The spelling of 864725920 in words is "eight hundred sixty-four million, seven hundred twenty-five thousand, nine hundred twenty".