256402530 has 128 divisors (see below), whose sum is σ = 726681600. Its totient is φ = 64152000.

The previous prime is 256402529. The next prime is 256402567. The reversal of 256402530 is 35204652.

256402530 is a `hidden beast` number, since 256 + 402 + 5 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 256402494 and 256402503.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 774465 + ... + 774795.

It is an arithmetic number, because the mean of its divisors is an integer number (5677200).

Almost surely, 2^256402530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256402530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363340800).

256402530 is an abundant number, since it is smaller than the sum of its proper divisors (470279070).

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

256402530 is a wasteful number, since it uses less digits than its factorization.

256402530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 256402530 is about 16012.5741216083. The cubic root of 256402530 is about 635.2930467938.

The spelling of 256402530 in words is "two hundred fifty-six million, four hundred two thousand, five hundred thirty".