215320656 has 40 divisors (see below), whose sum is σ = 556776864. Its totient is φ = 71704960.

The previous prime is 215320631. The next prime is 215320663. The reversal of 215320656 is 656023512.

It is a congruent number.

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, 85690 + ... + 88166.

Almost surely, 2^215320656 is an apocalyptic number.

It is an amenable number.

215320656 is an abundant number, since it is smaller than the sum of its proper divisors (341456208).

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

215320656 is a wasteful number, since it uses less digits than its factorization.

215320656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4299 (or 4293 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 215320656 is about 14673.8085035890. The cubic root of 215320656 is about 599.3703171749.

The spelling of 215320656 in words is "two hundred fifteen million, three hundred twenty thousand, six hundred fifty-six".