215535056 has 40 divisors (see below), whose sum is σ = 458676000. Its totient is φ = 97301120.

The previous prime is 215535041. The next prime is 215535059. The reversal of 215535056 is 650535512.

215535056 is digitally balanced in base 2 and base 3, because in such bases 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 (215535059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22115 + ... + 30333.

It is an arithmetic number, because the mean of its divisors is an integer number (11466900).

Almost surely, 2^215535056 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 215535056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229338000).

215535056 is an abundant number, since it is smaller than the sum of its proper divisors (243140944).

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

215535056 is a wasteful number, since it uses less digits than its factorization.

215535056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8387 (or 8381 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 215535056 is about 14681.1122194471. The cubic root of 215535056 is about 599.5691870373.

The spelling of 215535056 in words is "two hundred fifteen million, five hundred thirty-five thousand, fifty-six".