231664560 has 80 divisors (see below), whose sum is σ = 728929536. Its totient is φ = 60850944.

The previous prime is 231664547. The next prime is 231664561. The reversal of 231664560 is 65466132.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (231664561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8877 + ... + 23283.

Almost surely, 2^231664560 is an apocalyptic number.

231664560 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 231664560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364464768).

231664560 is an abundant number, since it is smaller than the sum of its proper divisors (497264976).

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

231664560 is a wasteful number, since it uses less digits than its factorization.

231664560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14490 (or 14484 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 231664560 is about 15220.5308711621. The cubic root of 231664560 is about 614.1670792043.

The spelling of 231664560 in words is "two hundred thirty-one million, six hundred sixty-four thousand, five hundred sixty".