231573640 has 16 divisors (see below), whose sum is σ = 521040780. Its totient is φ = 92629440.

The previous prime is 231573631. The next prime is 231573647. The reversal of 231573640 is 46375132.

It can be written as a sum of positive squares in 2 ways, for example, as 191047684 + 40525956 = 13822^2 + 6366^2 .

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (231573647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2894631 + ... + 2894710.

Almost surely, 2^231573640 is an apocalyptic number.

231573640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231573640 is an abundant number, since it is smaller than the sum of its proper divisors (289467140).

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

231573640 is a wasteful number, since it uses less digits than its factorization.

231573640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5789352 (or 5789348 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 231573640 is about 15217.5438228382. The cubic root of 231573640 is about 614.0867225347.

The spelling of 231573640 in words is "two hundred thirty-one million, five hundred seventy-three thousand, six hundred forty".