256663008 has 144 divisors (see below), whose sum is σ = 883340640. Its totient is φ = 69009408.

The previous prime is 256663007. The next prime is 256663031. The reversal of 256663008 is 800366652.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256663007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30528 + ... + 38016.

It is an arithmetic number, because the mean of its divisors is an integer number (6134310).

Almost surely, 2^256663008 is an apocalyptic number.

256663008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256663008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (441670320).

256663008 is an abundant number, since it is smaller than the sum of its proper divisors (626677632).

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

256663008 is a wasteful number, since it uses less digits than its factorization.

256663008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7529 (or 7518 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 256663008 is about 16020.7056024384. The cubic root of 256663008 is about 635.5081042884.

The spelling of 256663008 in words is "two hundred fifty-six million, six hundred sixty-three thousand, eight".