215857152 has 216 divisors, whose sum is σ = 728254800. Its totient is φ = 61415424.

The previous prime is 215857141. The next prime is 215857153. The reversal of 215857152 is 251758512.

215857152 is a `hidden beast` number, since 2 + 1 + 585 + 71 + 5 + 2 = 666.

It is a super-2 number, since 2×215857152² = 93188620139102208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215857153) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 903049 + ... + 903287.

It is an arithmetic number, because the mean of its divisors is an integer number (3371550).

Almost surely, 2^215857152 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 215857152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364127400).

215857152 is an abundant number, since it is smaller than the sum of its proper divisors (512397648).

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

215857152 is a wasteful number, since it uses less digits than its factorization.

215857152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 251 counting only the distinct ones).

The product of its digits is 28000, while the sum is 36.

The square root of 215857152 is about 14692.0778652987. The cubic root of 215857152 is about 599.8677041652.

The spelling of 215857152 in words is "two hundred fifteen million, eight hundred fifty-seven thousand, one hundred fifty-two".