256339770 has 64 divisors (see below), whose sum is σ = 666610560. Its totient is φ = 62834688.

The previous prime is 256339757. The next prime is 256339771. The reversal of 256339770 is 77933652.

It is a happy number.

256339770 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256339771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16086 + ... + 27774.

It is an arithmetic number, because the mean of its divisors is an integer number (10415790).

Almost surely, 2^256339770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256339770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333305280).

256339770 is an abundant number, since it is smaller than the sum of its proper divisors (410270790).

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

256339770 is a wasteful number, since it uses less digits than its factorization.

256339770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11759.

The product of its (nonzero) digits is 238140, while the sum is 42.

The square root of 256339770 is about 16010.6142917753. The cubic root of 256339770 is about 635.2412087130.

The spelling of 256339770 in words is "two hundred fifty-six million, three hundred thirty-nine thousand, seven hundred seventy".