231621264 has 120 divisors (see below), whose sum is σ = 756737280. Its totient is φ = 64756224.

The previous prime is 231621253. The next prime is 231621281. The reversal of 231621264 is 462126132.

231621264 is a `hidden beast` number, since 2 + 31 + 621 + 2 + 6 + 4 = 666.

It is a nude number because it is divisible by every one of its digits.

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, 44932 + ... + 49820.

It is an arithmetic number, because the mean of its divisors is an integer number (6306144).

Almost surely, 2^231621264 is an apocalyptic number.

231621264 is a gapful number since it is divisible by the number (24) 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 231621264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378368640).

231621264 is an abundant number, since it is smaller than the sum of its proper divisors (525116016).

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

231621264 is a wasteful number, since it uses less digits than its factorization.

231621264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4957 (or 4948 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 231621264 is about 15219.1085152843. The cubic root of 231621264 is about 614.1288160727.

Adding to 231621264 its reverse (462126132), we get a palindrome (693747396).

The spelling of 231621264 in words is "two hundred thirty-one million, six hundred twenty-one thousand, two hundred sixty-four".