231622560 has 144 divisors (see below), whose sum is σ = 851281704. Its totient is φ = 57010176.

The previous prime is 231622543. The next prime is 231622577. The reversal of 231622560 is 65226132.

231622560 is a `hidden beast` number, since 2 + 31 + 622 + 5 + 6 + 0 = 666.

231622560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231622543) and next prime (231622577).

It can be written as a sum of positive squares in 4 ways, for example, as 146023056 + 85599504 = 12084^2 + 9252^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12534 + ... + 24906.

Almost surely, 2^231622560 is an apocalyptic number.

231622560 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 231622560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425640852).

231622560 is an abundant number, since it is smaller than the sum of its proper divisors (619659144).

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

231622560 is a wasteful number, since it uses less digits than its factorization.

231622560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12407 (or 12396 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 231622560 is about 15219.1510932772. The cubic root of 231622560 is about 614.1299614907.

Adding to 231622560 its reverse (65226132), we get a palindrome (296848692).

The spelling of 231622560 in words is "two hundred thirty-one million, six hundred twenty-two thousand, five hundred sixty".