1256664 has 16 divisors (see below), whose sum is σ = 3141720. Its totient is φ = 418880.

The previous prime is 1256659. The next prime is 1256681. The reversal of 1256664 is 4666521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26157 + ... + 26204.

2^1256664 is an apocalyptic number.

It is an amenable number.

1256664 is an abundant number, since it is smaller than the sum of its proper divisors (1885056).

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

1256664 is a wasteful number, since it uses less digits than its factorization.

1256664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52370 (or 52366 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 1256664 is about 1121.0102586507. The cubic root of 1256664 is about 107.9128240277.

The spelling of 1256664 in words is "one million, two hundred fifty-six thousand, six hundred sixty-four".