647640474 has 32 divisors (see below), whose sum is σ = 1396362240. Its totient is φ = 199067712.

The previous prime is 647640431. The next prime is 647640481. The reversal of 647640474 is 474046746.

647640474 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82759 + ... + 90245.

It is an arithmetic number, because the mean of its divisors is an integer number (43636320).

Almost surely, 2^647640474 is an apocalyptic number.

647640474 is an abundant number, since it is smaller than the sum of its proper divisors (748721766).

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

647640474 is a wasteful number, since it uses less digits than its factorization.

647640474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8614.

The product of its (nonzero) digits is 451584, while the sum is 42.

The square root of 647640474 is about 25448.7813853630. The cubic root of 647640474 is about 865.1896736210.

The spelling of 647640474 in words is "six hundred forty-seven million, six hundred forty thousand, four hundred seventy-four".