215854864 has 15 divisors (see below), whose sum is σ = 418332693. Its totient is φ = 107898048.

The previous prime is 215854861. The next prime is 215854897. The reversal of 215854864 is 468458512.

The square root of 215854864 is 14692.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 201867264 = 3740^2 + 14208^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215854864.

It is not an unprimeable number, because it can be changed into a prime (215854861) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 56932 + ... + 60604.

Almost surely, 2^215854864 is an apocalyptic number.

215854864 is the 14692-nd square number.

It is an amenable number.

215854864 is a deficient number, since it is larger than the sum of its proper divisors (202477829).

215854864 is an frugal number, since it uses more digits than its factorization.

215854864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7354 (or 3675 counting only the distinct ones).

The product of its digits is 307200, while the sum is 43.

The cubic root of 215854864 is about 599.8655847046.

The spelling of 215854864 in words is "two hundred fifteen million, eight hundred fifty-four thousand, eight hundred sixty-four".