215993256 has 32 divisors (see below), whose sum is σ = 543305760. Its totient is φ = 71554752.

The previous prime is 215993249. The next prime is 215993353. The reversal of 215993256 is 652399512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23695 + ... + 31518.

It is an arithmetic number, because the mean of its divisors is an integer number (16978305).

Almost surely, 2^215993256 is an apocalyptic number.

It is an amenable number.

215993256 is an abundant number, since it is smaller than the sum of its proper divisors (327312504).

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

215993256 is a wasteful number, since it uses less digits than its factorization.

215993256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55385 (or 55381 counting only the distinct ones).

The product of its digits is 145800, while the sum is 42.

The square root of 215993256 is about 14696.7090193689. The cubic root of 215993256 is about 599.9937554906.

The spelling of 215993256 in words is "two hundred fifteen million, nine hundred ninety-three thousand, two hundred fifty-six".