231645320 has 16 divisors (see below), whose sum is σ = 521202060. Its totient is φ = 92658112.

The previous prime is 231645319. The next prime is 231645329. The reversal of 231645320 is 23546132.

It can be written as a sum of positive squares in 2 ways, for example, as 229401316 + 2244004 = 15146^2 + 1498^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 231645320.

It is not an unprimeable number, because it can be changed into a prime (231645329) 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, 2895527 + ... + 2895606.

Almost surely, 2^231645320 is an apocalyptic number.

231645320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231645320 is an abundant number, since it is smaller than the sum of its proper divisors (289556740).

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

231645320 is a wasteful number, since it uses less digits than its factorization.

231645320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791144 (or 5791140 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 231645320 is about 15219.8988170093. The cubic root of 231645320 is about 614.1500763133.

The spelling of 231645320 in words is "two hundred thirty-one million, six hundred forty-five thousand, three hundred twenty".