231687864 has 56 divisors (see below), whose sum is σ = 651340560. Its totient is φ = 77227344.

The previous prime is 231687853. The next prime is 231687871. The reversal of 231687864 is 468786132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 14032 + ... + 25695.

Almost surely, 2^231687864 is an apocalyptic number.

231687864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

231687864 is an abundant number, since it is smaller than the sum of its proper divisors (419652696).

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

231687864 is an equidigital number, since it uses as much as digits as its factorization.

231687864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39751 (or 39732 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 231687864 is about 15221.2963968251. The cubic root of 231687864 is about 614.1876722976.

The spelling of 231687864 in words is "two hundred thirty-one million, six hundred eighty-seven thousand, eight hundred sixty-four".