647256 has 32 divisors (see below), whose sum is σ = 1638000. Its totient is φ = 213120.

The previous prime is 647219. The next prime is 647261. The reversal of 647256 is 652746.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647256.

It is an unprimeable number.

647256 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3486 + ... + 3666.

2⁶⁴⁷²⁵⁶ is an apocalyptic number.

It is an amenable number.

647256 is an abundant number, since it is smaller than the sum of its proper divisors (990744).

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

647256 is a wasteful number, since it uses less digits than its factorization.

647256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 335 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 647256 is about 804.5222184626. The cubic root of 647256 is about 86.5018432120.

It can be divided in two parts, 647 and 256, that added together give a triangular number (903 = T₄₂).

The spelling of 647256 in words is "six hundred forty-seven thousand, two hundred fifty-six".