231305664 has 56 divisors (see below), whose sum is σ = 638616960. Its totient is φ = 73748224.

The previous prime is 231305629. The next prime is 231305693. The reversal of 231305664 is 466503132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21774 + ... + 30605.

Almost surely, 2^231305664 is an apocalyptic number.

231305664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

231305664 is an abundant number, since it is smaller than the sum of its proper divisors (407311296).

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

231305664 is a wasteful number, since it uses less digits than its factorization.

231305664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52417 (or 52407 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 231305664 is about 15208.7364366669. The cubic root of 231305664 is about 613.8497582863.

Adding to 231305664 its reverse (466503132), we get a palindrome (697808796).

The spelling of 231305664 in words is "two hundred thirty-one million, three hundred five thousand, six hundred sixty-four".