256663710 has 72 divisors (see below), whose sum is σ = 682354296. Its totient is φ = 66935520.

The previous prime is 256663691. The next prime is 256663711. The reversal of 256663710 is 17366652.

256663710 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256663711) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 198165 + ... + 199455.

It is an arithmetic number, because the mean of its divisors is an integer number (9477143).

Almost surely, 2^256663710 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256663710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341177148).

256663710 is an abundant number, since it is smaller than the sum of its proper divisors (425690586).

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

256663710 is a wasteful number, since it uses less digits than its factorization.

256663710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1348 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 256663710 is about 16020.7275115708. The cubic root of 256663710 is about 635.5086836814.

The spelling of 256663710 in words is "two hundred fifty-six million, six hundred sixty-three thousand, seven hundred ten".