256557150 has 72 divisors (see below), whose sum is σ = 697689720. Its totient is φ = 67581120.

The previous prime is 256557139. The next prime is 256557163. The reversal of 256557150 is 51755652.

It is a happy number.

256557150 is a `hidden beast` number, since 2 + 56 + 557 + 1 + 50 = 666.

256557150 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×256557150² = 131643142432245000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 33916 + ... + 40784.

It is an arithmetic number, because the mean of its divisors is an integer number (9690135).

Almost surely, 2^256557150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256557150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348844860).

256557150 is an abundant number, since it is smaller than the sum of its proper divisors (441132570).

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

256557150 is a wasteful number, since it uses less digits than its factorization.

256557150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6970 (or 6962 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 36.

The square root of 256557150 is about 16017.4014746463. The cubic root of 256557150 is about 635.4207226950.

The spelling of 256557150 in words is "two hundred fifty-six million, five hundred fifty-seven thousand, one hundred fifty".