215661258 has 32 divisors (see below), whose sum is σ = 481048320. Its totient is φ = 71616960.

The previous prime is 215661247. The next prime is 215661263. The reversal of 215661258 is 852166512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7266 + ... + 22002.

It is an arithmetic number, because the mean of its divisors is an integer number (15032760).

Almost surely, 2^215661258 is an apocalyptic number.

215661258 is an abundant number, since it is smaller than the sum of its proper divisors (265387062).

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

215661258 is a wasteful number, since it uses less digits than its factorization.

215661258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15019 (or 15013 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 215661258 is about 14685.4096980643. The cubic root of 215661258 is about 599.6861858965.

The spelling of 215661258 in words is "two hundred fifteen million, six hundred sixty-one thousand, two hundred fifty-eight".