647256156 has 24 divisors (see below), whose sum is σ = 1575928704. Its totient is φ = 206371440.

The previous prime is 647256139. The next prime is 647256157. The reversal of 647256156 is 651652746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647256157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1172290 + ... + 1172841.

It is an arithmetic number, because the mean of its divisors is an integer number (65663696).

Almost surely, 2^647256156 is an apocalyptic number.

It is an amenable number.

647256156 is an abundant number, since it is smaller than the sum of its proper divisors (928672548).

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

647256156 is a wasteful number, since it uses less digits than its factorization.

647256156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345161 (or 2345159 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 647256156 is about 25441.2294514239. The cubic root of 647256156 is about 865.0185016146.

The spelling of 647256156 in words is "six hundred forty-seven million, two hundred fifty-six thousand, one hundred fifty-six".