256874885 has 8 divisors (see below), whose sum is σ = 308374776. Its totient is φ = 205416640.

The previous prime is 256874873. The next prime is 256874903. The reversal of 256874885 is 588478652.

It can be written as a sum of positive squares in 4 ways, for example, as 115906756 + 140968129 = 10766^2 + 11873^2 .

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

It is not a de Polignac number, because 256874885 - 2⁴ = 256874869 is a prime.

It is a Duffinian number.

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, 5327 + ... + 23283.

It is an arithmetic number, because the mean of its divisors is an integer number (38546847).

Almost surely, 2^256874885 is an apocalyptic number.

It is an amenable number.

256874885 is a deficient number, since it is larger than the sum of its proper divisors (51499891).

256874885 is a wasteful number, since it uses less digits than its factorization.

256874885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20823.

The product of its digits is 4300800, while the sum is 53.

The square root of 256874885 is about 16027.3168372002. The cubic root of 256874885 is about 635.6829282301.

The spelling of 256874885 in words is "two hundred fifty-six million, eight hundred seventy-four thousand, eight hundred eighty-five".