256691484 has 48 divisors (see below), whose sum is σ = 760569600. Its totient is φ = 73340208.

The previous prime is 256691473. The next prime is 256691507. The reversal of 256691484 is 484196652.

256691484 is a `hidden beast` number, since 2 + 566 + 9 + 1 + 4 + 84 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169014 + ... + 170525.

It is an arithmetic number, because the mean of its divisors is an integer number (15845200).

Almost surely, 2^256691484 is an apocalyptic number.

It is an amenable number.

256691484 is an abundant number, since it is smaller than the sum of its proper divisors (503878116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256691484 is a wasteful number, since it uses less digits than its factorization.

256691484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339559 (or 339551 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 256691484 is about 16021.5943026904. The cubic root of 256691484 is about 635.5316059994.

The spelling of 256691484 in words is "two hundred fifty-six million, six hundred ninety-one thousand, four hundred eighty-four".