256423504 has 40 divisors (see below), whose sum is σ = 526966272. Its totient is φ = 120616320.

The previous prime is 256423501. The next prime is 256423561. The reversal of 256423504 is 405324652.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256423501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16737 + ... + 28159.

Almost surely, 2^256423504 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 256423504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263483136).

256423504 is an abundant number, since it is smaller than the sum of its proper divisors (270542768).

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

256423504 is a wasteful number, since it uses less digits than its factorization.

256423504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11515 (or 11509 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 256423504 is about 16013.2290310231. The cubic root of 256423504 is about 635.3103688707.

The spelling of 256423504 in words is "two hundred fifty-six million, four hundred twenty-three thousand, five hundred four".