215861464 has 48 divisors (see below), whose sum is σ = 507049200. Its totient is φ = 85393728.

The previous prime is 215861453. The next prime is 215861491. The reversal of 215861464 is 464168512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16084 + ... + 26275.

It is an arithmetic number, because the mean of its divisors is an integer number (10563525).

Almost surely, 2^215861464 is an apocalyptic number.

It is an amenable number.

215861464 is an abundant number, since it is smaller than the sum of its proper divisors (291187736).

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

215861464 is a wasteful number, since it uses less digits than its factorization.

215861464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42392 (or 42381 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 215861464 is about 14692.2246103168. The cubic root of 215861464 is about 599.8716984924.

The spelling of 215861464 in words is "two hundred fifteen million, eight hundred sixty-one thousand, four hundred sixty-four".