256617492 has 12 divisors (see below), whose sum is σ = 598774176. Its totient is φ = 85539160.

The previous prime is 256617481. The next prime is 256617497. The reversal of 256617492 is 294716652.

256617492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256617497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10692384 + ... + 10692407.

It is an arithmetic number, because the mean of its divisors is an integer number (49897848).

Almost surely, 2^256617492 is an apocalyptic number.

It is an amenable number.

256617492 is an abundant number, since it is smaller than the sum of its proper divisors (342156684).

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

256617492 is a wasteful number, since it uses less digits than its factorization.

256617492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21384798 (or 21384796 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 256617492 is about 16019.2850027709. The cubic root of 256617492 is about 635.4705355750.

It can be divided in two parts, 25661 and 7492, that added together give a triangular number (33153 = T₂₅₇).

The spelling of 256617492 in words is "two hundred fifty-six million, six hundred seventeen thousand, four hundred ninety-two".