256564135 has 8 divisors (see below), whose sum is σ = 307987776. Its totient is φ = 205177440.

The previous prime is 256564129. The next prime is 256564157. The reversal of 256564135 is 531465652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256564135 - 2²¹ = 254466983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256564094 and 256564103.

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, 9505 + ... + 24565.

It is an arithmetic number, because the mean of its divisors is an integer number (38498472).

Almost surely, 2^256564135 is an apocalyptic number.

256564135 is a deficient number, since it is larger than the sum of its proper divisors (51423641).

256564135 is a wasteful number, since it uses less digits than its factorization.

256564135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18473.

The product of its digits is 108000, while the sum is 37.

The square root of 256564135 is about 16017.6195172691. The cubic root of 256564135 is about 635.4264892769.

It can be divided in two parts, 25656 and 4135, that added together give a cube (29791 = 31³).

The spelling of 256564135 in words is "two hundred fifty-six million, five hundred sixty-four thousand, one hundred thirty-five".