256138710 has 16 divisors (see below), whose sum is σ = 614732976. Its totient is φ = 68303648.

The previous prime is 256138703. The next prime is 256138721. The reversal of 256138710 is 17831652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4268949 + ... + 4269008.

It is an arithmetic number, because the mean of its divisors is an integer number (38420811).

Almost surely, 2^256138710 is an apocalyptic number.

256138710 is an abundant number, since it is smaller than the sum of its proper divisors (358594266).

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

256138710 is a wasteful number, since it uses less digits than its factorization.

256138710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8537967.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 256138710 is about 16004.3341004867. The cubic root of 256138710 is about 635.0750815390.

The spelling of 256138710 in words is "two hundred fifty-six million, one hundred thirty-eight thousand, seven hundred ten".