231527640 has 64 divisors (see below), whose sum is σ = 709378560. Its totient is φ = 60425600.

The previous prime is 231527551. The next prime is 231527657. The reversal of 231527640 is 46725132.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 231527598 and 231527607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14886 + ... + 26165.

It is an arithmetic number, because the mean of its divisors is an integer number (11084040).

Almost surely, 2^231527640 is an apocalyptic number.

231527640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231527640 is an abundant number, since it is smaller than the sum of its proper divisors (477850920).

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

231527640 is a wasteful number, since it uses less digits than its factorization.

231527640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41112 (or 41108 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 231527640 is about 15216.0323343505. The cubic root of 231527640 is about 614.0460589257.

The spelling of 231527640 in words is "two hundred thirty-one million, five hundred twenty-seven thousand, six hundred forty".