231612740 has 24 divisors (see below), whose sum is σ = 486695832. Its totient is φ = 92586240.

The previous prime is 231612727. The next prime is 231612751. The reversal of 231612740 is 47216132.

It can be written as a sum of positive squares in 4 ways, for example, as 91853056 + 139759684 = 9584^2 + 11822^2 .

It is a super-2 number, since 2×231612740² = 107288922660615200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43082 + ... + 48158.

It is an arithmetic number, because the mean of its divisors is an integer number (20278993).

Almost surely, 2^231612740 is an apocalyptic number.

231612740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231612740 is an abundant number, since it is smaller than the sum of its proper divisors (255083092).

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

231612740 is a wasteful number, since it uses less digits than its factorization.

231612740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7367 (or 7365 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 231612740 is about 15218.8284700236. The cubic root of 231612740 is about 614.1212823686.

Adding to 231612740 its reverse (47216132), we get a palindrome (278828872).

The spelling of 231612740 in words is "two hundred thirty-one million, six hundred twelve thousand, seven hundred forty".