256503436 has 18 divisors (see below), whose sum is σ = 522168108. Its totient is φ = 109929960.

The previous prime is 256503433. The next prime is 256503437. The reversal of 256503436 is 634305652.

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

It is not an unprimeable number, because it can be changed into a prime (256503433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654150 + ... + 654541.

Almost surely, 2^256503436 is an apocalyptic number.

It is an amenable number.

256503436 is an abundant number, since it is smaller than the sum of its proper divisors (265664672).

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

256503436 is a wasteful number, since it uses less digits than its factorization.

256503436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308709 (or 1308700 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 34.

The square root of 256503436 is about 16015.7246479827. The cubic root of 256503436 is about 635.3763747191.

The spelling of 256503436 in words is "two hundred fifty-six million, five hundred three thousand, four hundred thirty-six".