256712985 has 48 divisors (see below), whose sum is σ = 453024000. Its totient is φ = 134462592.

The previous prime is 256712957. The next prime is 256713043. The reversal of 256712985 is 589217652.

256712985 is a `hidden beast` number, since 2 + 567 + 1 + 2 + 9 + 85 = 666.

It is not a de Polignac number, because 256712985 - 2¹³ = 256704793 is a prime.

It is a super-2 number, since 2×256712985² = 131803113335220450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 256712985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 975964 + ... + 976226.

It is an arithmetic number, because the mean of its divisors is an integer number (9438000).

Almost surely, 2^256712985 is an apocalyptic number.

It is an amenable number.

256712985 is a deficient number, since it is larger than the sum of its proper divisors (196311015).

256712985 is a wasteful number, since it uses less digits than its factorization.

256712985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582 (or 579 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 256712985 is about 16022.2652892779. The cubic root of 256712985 is about 635.5493499767.

The spelling of 256712985 in words is "two hundred fifty-six million, seven hundred twelve thousand, nine hundred eighty-five".