256645635 has 16 divisors (see below), whose sum is σ = 432245760. Its totient is φ = 129673440.

The previous prime is 256645633. The next prime is 256645667. The reversal of 256645635 is 536546652.

It is not a de Polignac number, because 256645635 - 2¹ = 256645633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256645633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449971 + ... + 450540.

It is an arithmetic number, because the mean of its divisors is an integer number (27015360).

Almost surely, 2^256645635 is an apocalyptic number.

256645635 is a deficient number, since it is larger than the sum of its proper divisors (175600125).

256645635 is a wasteful number, since it uses less digits than its factorization.

256645635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900538.

The product of its digits is 648000, while the sum is 42.

The square root of 256645635 is about 16020.1633886799. The cubic root of 256645635 is about 635.4937652120.

The spelling of 256645635 in words is "two hundred fifty-six million, six hundred forty-five thousand, six hundred thirty-five".