256399896 has 32 divisors (see below), whose sum is σ = 656636400. Its totient is φ = 83381760.

The previous prime is 256399877. The next prime is 256399901. The reversal of 256399896 is 698993652.

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, 129301 + ... + 131268.

Almost surely, 2^256399896 is an apocalyptic number.

It is an amenable number.

256399896 is an abundant number, since it is smaller than the sum of its proper divisors (400236504).

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

256399896 is a wasteful number, since it uses less digits than its factorization.

256399896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260619 (or 260615 counting only the distinct ones).

The product of its digits is 6298560, while the sum is 57.

The square root of 256399896 is about 16012.4918735342. The cubic root of 256399896 is about 635.2908713503.

The spelling of 256399896 in words is "two hundred fifty-six million, three hundred ninety-nine thousand, eight hundred ninety-six".