231533568 has 264 divisors, whose sum is σ = 792794912. Its totient is φ = 63700992.

The previous prime is 231533539. The next prime is 231533579. The reversal of 231533568 is 865335132.

231533568 is a `hidden beast` number, since 2 + 315 + 335 + 6 + 8 = 666.

It is a super-2 number, since 2×231533568² = 107215586221621248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2386896 + ... + 2386992.

Almost surely, 2^231533568 is an apocalyptic number.

231533568 is a gapful number since it is divisible by the number (28) 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 231533568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (396397456).

231533568 is an abundant number, since it is smaller than the sum of its proper divisors (561261344).

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

231533568 is a wasteful number, since it uses less digits than its factorization.

231533568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 146 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 231533568 is about 15216.2271276424. The cubic root of 231533568 is about 614.0512995296.

The spelling of 231533568 in words is "two hundred thirty-one million, five hundred thirty-three thousand, five hundred sixty-eight".