647973164 has 18 divisors (see below), whose sum is σ = 1153868940. Its totient is φ = 318303072.

The previous prime is 647973121. The next prime is 647973167. The reversal of 647973164 is 461379746.

It is a happy number.

647973164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (647973167) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 390224 + ... + 391880.

It is an arithmetic number, because the mean of its divisors is an integer number (64103830).

Almost surely, 2^647973164 is an apocalyptic number.

It is an amenable number.

647973164 is a deficient number, since it is larger than the sum of its proper divisors (505895776).

647973164 is an equidigital number, since it uses as much as digits as its factorization.

647973164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377 (or 1718 counting only the distinct ones).

The product of its digits is 762048, while the sum is 47.

The square root of 647973164 is about 25455.3170084366. The cubic root of 647973164 is about 865.3377962759.

The spelling of 647973164 in words is "six hundred forty-seven million, nine hundred seventy-three thousand, one hundred sixty-four".