231664320 has 112 divisors (see below), whose sum is σ = 817290720. Its totient is φ = 61774848.

The previous prime is 231664273. The next prime is 231664337. The reversal of 231664320 is 23466132.

231664320 is a `hidden beast` number, since 2 + 3 + 16 + 643 + 2 + 0 = 666.

It is a super-2 number, since 2×231664320² = 107336714322124800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4767 + ... + 22046.

Almost surely, 2^231664320 is an apocalyptic number.

231664320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231664320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (408645360).

231664320 is an abundant number, since it is smaller than the sum of its proper divisors (585626400).

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

231664320 is a wasteful number, since it uses less digits than its factorization.

231664320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26839 (or 26823 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 231664320 is about 15220.5229870724. The cubic root of 231664320 is about 614.1668671158.

The spelling of 231664320 in words is "two hundred thirty-one million, six hundred sixty-four thousand, three hundred twenty".