64512216 has 24 divisors (see below), whose sum is σ = 174720780. Its totient is φ = 21504048.

The previous prime is 64512167. The next prime is 64512221. The reversal of 64512216 is 61221546.

64512216 is a `hidden beast` number, since 645 + 1 + 2 + 2 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 64512216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 447930 + ... + 448073.

Almost surely, 2^64512216 is an apocalyptic number.

It is an amenable number.

64512216 is an abundant number, since it is smaller than the sum of its proper divisors (110208564).

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

64512216 is a wasteful number, since it uses less digits than its factorization.

64512216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896015 (or 896008 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 64512216 is about 8031.9497010377. The cubic root of 64512216 is about 401.0642824126.

The spelling of 64512216 in words is "sixty-four million, five hundred twelve thousand, two hundred sixteen".