216863712 has 72 divisors (see below), whose sum is σ = 664156584. Its totient is φ = 66726144.

The previous prime is 216863677. The next prime is 216863729. The reversal of 216863712 is 217368612.

216863712 is a `hidden beast` number, since 2 + 1 + 6 + 8 + 637 + 12 = 666.

216863712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 25218 + ... + 32705.

It is an arithmetic number, because the mean of its divisors is an integer number (9224397).

Almost surely, 2^216863712 is an apocalyptic number.

It is an amenable number.

216863712 is an abundant number, since it is smaller than the sum of its proper divisors (447292872).

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

216863712 is a wasteful number, since it uses less digits than its factorization.

216863712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57952 (or 57941 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 216863712 is about 14726.2932199519. The cubic root of 216863712 is about 600.7986697394.

The spelling of 216863712 in words is "two hundred sixteen million, eight hundred sixty-three thousand, seven hundred twelve".