215931328 has 28 divisors (see below), whose sum is σ = 436580280. Its totient is φ = 105926912.

The previous prime is 215931323. The next prime is 215931329. The reversal of 215931328 is 823139512.

It is a junction number, because it is equal to n+sod(n) for n = 215931293 and 215931302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215931323) 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, 28438 + ... + 35221.

Almost surely, 2^215931328 is an apocalyptic number.

It is an amenable number.

215931328 is an abundant number, since it is smaller than the sum of its proper divisors (220648952).

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

215931328 is an equidigital number, since it uses as much as digits as its factorization.

215931328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63724 (or 63714 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 215931328 is about 14694.6020020959. The cubic root of 215931328 is about 599.9364080752.

The spelling of 215931328 in words is "two hundred fifteen million, nine hundred thirty-one thousand, three hundred twenty-eight".