231645664 has 12 divisors (see below), whose sum is σ = 456052464. Its totient is φ = 115822816.

The previous prime is 231645653. The next prime is 231645697. The reversal of 231645664 is 466546132.

231645664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3619432 + ... + 3619495.

It is an arithmetic number, because the mean of its divisors is an integer number (38004372).

Almost surely, 2^231645664 is an apocalyptic number.

It is an amenable number.

231645664 is a deficient number, since it is larger than the sum of its proper divisors (224406800).

231645664 is an equidigital number, since it uses as much as digits as its factorization.

231645664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7238937 (or 7238929 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The square root of 231645664 is about 15219.9101180000. The cubic root of 231645664 is about 614.1503803234.

The spelling of 231645664 in words is "two hundred thirty-one million, six hundred forty-five thousand, six hundred sixty-four".