647879904 has 96 divisors (see below), whose sum is σ = 2159619840. Its totient is φ = 185106816.

The previous prime is 647879887. The next prime is 647879927. The reversal of 647879904 is 409978746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 47514 + ... + 59609.

It is an arithmetic number, because the mean of its divisors is an integer number (22496040).

Almost surely, 2^647879904 is an apocalyptic number.

It is an amenable number.

647879904 is an abundant number, since it is smaller than the sum of its proper divisors (1511739936).

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

647879904 is a wasteful number, since it uses less digits than its factorization.

647879904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107149 (or 107135 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 647879904 is about 25453.4851051875. The cubic root of 647879904 is about 865.2962794974.

It can be divided in two parts, 64787 and 9904, that added together give a triangular number (74691 = T₃₈₆).

The spelling of 647879904 in words is "six hundred forty-seven million, eight hundred seventy-nine thousand, nine hundred four".