647880804 has 36 divisors (see below), whose sum is σ = 1681964284. Its totient is φ = 210123072.

The previous prime is 647880799. The next prime is 647880833. The reversal of 647880804 is 408088746.

It can be written as a sum of positive squares in 2 ways, for example, as 603684900 + 44195904 = 24570^2 + 6648^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 647880804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241867 + ... + 244530.

Almost surely, 2^647880804 is an apocalyptic number.

It is an amenable number.

647880804 is an abundant number, since it is smaller than the sum of its proper divisors (1034083480).

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

647880804 is a wasteful number, since it uses less digits than its factorization.

647880804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486444 (or 486439 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 647880804 is about 25453.5027844892. The cubic root of 647880804 is about 865.2966801716.

The spelling of 647880804 in words is "six hundred forty-seven million, eight hundred eighty thousand, eight hundred four".