256828605 has 128 divisors (see below), whose sum is σ = 514252800. Its totient is φ = 107827200.

The previous prime is 256828601. The next prime is 256828613. The reversal of 256828605 is 506828652.

It is not a de Polignac number, because 256828605 - 2² = 256828601 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256828601) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3250956 + ... + 3251034.

It is an arithmetic number, because the mean of its divisors is an integer number (4017600).

Almost surely, 2^256828605 is an apocalyptic number.

It is an amenable number.

256828605 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

256828605 is a wasteful number, since it uses less digits than its factorization.

256828605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195.

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 256828605 is about 16025.8729871418. The cubic root of 256828605 is about 635.6447498864.

The spelling of 256828605 in words is "two hundred fifty-six million, eight hundred twenty-eight thousand, six hundred five".