215926656 has 256 divisors, whose sum is σ = 690923520. Its totient is φ = 58982400.

The previous prime is 215926651. The next prime is 215926657. The reversal of 215926656 is 656629512.

215926656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215926651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2226000 + ... + 2226096.

It is an arithmetic number, because the mean of its divisors is an integer number (2698920).

Almost surely, 2^215926656 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 215926656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345461760).

215926656 is an abundant number, since it is smaller than the sum of its proper divisors (474996864).

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

215926656 is a wasteful number, since it uses less digits than its factorization.

215926656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 161 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 215926656 is about 14694.4430312959. The cubic root of 215926656 is about 599.9320812009.

The spelling of 215926656 in words is "two hundred fifteen million, nine hundred twenty-six thousand, six hundred fifty-six".