256909896 has 144 divisors (see below), whose sum is σ = 743558400. Its totient is φ = 80084160.

The previous prime is 256909883. The next prime is 256909901. The reversal of 256909896 is 698909652.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3251985 + ... + 3252063.

It is an arithmetic number, because the mean of its divisors is an integer number (5163600).

Almost surely, 2^256909896 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 256909896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371779200).

256909896 is an abundant number, since it is smaller than the sum of its proper divisors (486648504).

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

256909896 is a wasteful number, since it uses less digits than its factorization.

256909896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 256909896 is about 16028.4090289710. The cubic root of 256909896 is about 635.7118072489.

The spelling of 256909896 in words is "two hundred fifty-six million, nine hundred nine thousand, eight hundred ninety-six".