215042656 has 96 divisors (see below), whose sum is σ = 476007840. Its totient is φ = 95133696.

The previous prime is 215042651. The next prime is 215042687. The reversal of 215042656 is 656240512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215042651) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 678210 + ... + 678526.

It is an arithmetic number, because the mean of its divisors is an integer number (4958415).

Almost surely, 2^215042656 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 215042656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238003920).

215042656 is an abundant number, since it is smaller than the sum of its proper divisors (260965184).

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

215042656 is a wasteful number, since it uses less digits than its factorization.

215042656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 215042656 is about 14664.3327840035. The cubic root of 215042656 is about 599.1122575404.

The spelling of 215042656 in words is "two hundred fifteen million, forty-two thousand, six hundred fifty-six".