216532656 has 40 divisors (see below), whose sum is σ = 621530160. Its totient is φ = 72177408.

The previous prime is 216532643. The next prime is 216532661. The reversal of 216532656 is 656235612.

It is a happy number.

It is a super-2 number, since 2×216532656² = 93772782228828672, which contains 22 as substring.

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 216532656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250185 + ... + 251048.

It is an arithmetic number, because the mean of its divisors is an integer number (15538254).

Almost surely, 2^216532656 is an apocalyptic number.

It is an amenable number.

216532656 is an abundant number, since it is smaller than the sum of its proper divisors (404997504).

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

216532656 is a wasteful number, since it uses less digits than its factorization.

216532656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501250 (or 501238 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 216532656 is about 14715.0486237729. The cubic root of 216532656 is about 600.4927951441.

The spelling of 216532656 in words is "two hundred sixteen million, five hundred thirty-two thousand, six hundred fifty-six".