231615560 has 128 divisors (see below), whose sum is σ = 599840640. Its totient is φ = 79718400.

The previous prime is 231615557. The next prime is 231615581. The reversal of 231615560 is 65516132.

It is a super-2 number, since 2×231615560² = 107291535268227200, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 667307 + ... + 667653.

It is an arithmetic number, because the mean of its divisors is an integer number (4686255).

Almost surely, 2^231615560 is an apocalyptic number.

231615560 is a gapful number since it is divisible by the number (20) 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 231615560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299920320).

231615560 is an abundant number, since it is smaller than the sum of its proper divisors (368225080).

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

231615560 is a wasteful number, since it uses less digits than its factorization.

231615560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 231615560 is about 15218.9211181345. The cubic root of 231615560 is about 614.1237747689.

The spelling of 231615560 in words is "two hundred thirty-one million, six hundred fifteen thousand, five hundred sixty".