256402488 has 48 divisors (see below), whose sum is σ = 662410440. Its totient is φ = 82703040.

The previous prime is 256402481. The next prime is 256402529. The reversal of 256402488 is 884204652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256402481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17506 + ... + 28622.

Almost surely, 2^256402488 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 256402488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331205220).

256402488 is an abundant number, since it is smaller than the sum of its proper divisors (406007952).

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

256402488 is a wasteful number, since it uses less digits than its factorization.

256402488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11188 (or 11153 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 39.

The square root of 256402488 is about 16012.5728101389. The cubic root of 256402488 is about 635.2930121057.

The spelling of 256402488 in words is "two hundred fifty-six million, four hundred two thousand, four hundred eighty-eight".