256689916 has 24 divisors (see below), whose sum is σ = 514161536. Its totient is φ = 109842480.

The previous prime is 256689911. The next prime is 256689929. The reversal of 256689916 is 619986652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256689911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12715 + ... + 25981.

Almost surely, 2^256689916 is an apocalyptic number.

It is an amenable number.

256689916 is an abundant number, since it is smaller than the sum of its proper divisors (257471620).

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

256689916 is a wasteful number, since it uses less digits than its factorization.

256689916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13969 (or 13967 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 52.

The square root of 256689916 is about 16021.5453686590. The cubic root of 256689916 is about 635.5303119485.

The spelling of 256689916 in words is "two hundred fifty-six million, six hundred eighty-nine thousand, nine hundred sixteen".