216613656 has 64 divisors (see below), whose sum is σ = 687667200. Its totient is φ = 61889184.

The previous prime is 216613637. The next prime is 216613669. The reversal of 216613656 is 656316612.

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

It is a self number, because there is not a number n which added to its sum of digits gives 216613656.

It is a congruent number.

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, 70120 + ... + 73143.

It is an arithmetic number, because the mean of its divisors is an integer number (10744800).

Almost surely, 2^216613656 is an apocalyptic number.

It is an amenable number.

216613656 is an abundant number, since it is smaller than the sum of its proper divisors (471053544).

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

216613656 is a wasteful number, since it uses less digits than its factorization.

216613656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143285 (or 143275 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 216613656 is about 14717.8006509125. The cubic root of 216613656 is about 600.5676627623.

The spelling of 216613656 in words is "two hundred sixteen million, six hundred thirteen thousand, six hundred fifty-six".