64215816 has 64 divisors (see below), whose sum is σ = 191462400. Its totient is φ = 17548608.

The previous prime is 64215797. The next prime is 64215829. The reversal of 64215816 is 61851246.

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, 4446 + ... + 12173.

It is an arithmetic number, because the mean of its divisors is an integer number (2991600).

Almost surely, 2^64215816 is an apocalyptic number.

It is an amenable number.

64215816 is an abundant number, since it is smaller than the sum of its proper divisors (127246584).

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

64215816 is a wasteful number, since it uses less digits than its factorization.

64215816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16658 (or 16654 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 64215816 is about 8013.4771479053. The cubic root of 64215816 is about 400.4491122235.

The spelling of 64215816 in words is "sixty-four million, two hundred fifteen thousand, eight hundred sixteen".