215626656 has 144 divisors (see below), whose sum is σ = 687403584. Its totient is φ = 58899456.

The previous prime is 215626637. The next prime is 215626673. The reversal of 215626656 is 656626512.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107196 + ... + 109188.

It is an arithmetic number, because the mean of its divisors is an integer number (4773636).

Almost surely, 2^215626656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215626656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343701792).

215626656 is an abundant number, since it is smaller than the sum of its proper divisors (471776928).

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

215626656 is a wasteful number, since it uses less digits than its factorization.

215626656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043 (or 2028 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 215626656 is about 14684.2315427127. The cubic root of 215626656 is about 599.6541117516.

The spelling of 215626656 in words is "two hundred fifteen million, six hundred twenty-six thousand, six hundred fifty-six".