256138152 has 64 divisors (see below), whose sum is σ = 660744000. Its totient is φ = 82690560.

The previous prime is 256138079. The next prime is 256138177. The reversal of 256138152 is 251831652.

256138152 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145743 + ... + 147489.

It is an arithmetic number, because the mean of its divisors is an integer number (10324125).

Almost surely, 2^256138152 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 256138152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330372000).

256138152 is an abundant number, since it is smaller than the sum of its proper divisors (404605848).

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

256138152 is a wasteful number, since it uses less digits than its factorization.

256138152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946 (or 1942 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 256138152 is about 16004.3166676994. The cubic root of 256138152 is about 635.0746203668.

The spelling of 256138152 in words is "two hundred fifty-six million, one hundred thirty-eight thousand, one hundred fifty-two".