215867864 has 16 divisors (see below), whose sum is σ = 404908200. Its totient is φ = 107892352.

The previous prime is 215867833. The next prime is 215867867. The reversal of 215867864 is 468768512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215867867) 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, 37379 + ... + 42765.

Almost surely, 2^215867864 is an apocalyptic number.

It is an amenable number.

215867864 is a deficient number, since it is larger than the sum of its proper divisors (189040336).

215867864 is a wasteful number, since it uses less digits than its factorization.

215867864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10402 (or 10398 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 215867864 is about 14692.4424109812. The cubic root of 215867864 is about 599.8776268949.

The spelling of 215867864 in words is "two hundred fifteen million, eight hundred sixty-seven thousand, eight hundred sixty-four".