647982956 has 48 divisors (see below), whose sum is σ = 1231749120. Its totient is φ = 297380160.

The previous prime is 647982943. The next prime is 647982997. The reversal of 647982956 is 659289746.

It is a happy number.

It is a super-2 number, since 2×647982956² = 839763822532995872, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361310 + ... + 363098.

It is an arithmetic number, because the mean of its divisors is an integer number (25661440).

Almost surely, 2^647982956 is an apocalyptic number.

It is an amenable number.

647982956 is a deficient number, since it is larger than the sum of its proper divisors (583766164).

647982956 is a wasteful number, since it uses less digits than its factorization.

647982956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974 (or 1972 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 56.

The square root of 647982956 is about 25455.5093447371. The cubic root of 647982956 is about 865.3421551730.

The spelling of 647982956 in words is "six hundred forty-seven million, nine hundred eighty-two thousand, nine hundred fifty-six".