647669904 has 160 divisors (see below), whose sum is σ = 1999395840. Its totient is φ = 176795136.

The previous prime is 647669899. The next prime is 647669923. The reversal of 647669904 is 409966746.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 733047 + ... + 733929.

It is an arithmetic number, because the mean of its divisors is an integer number (12496224).

Almost surely, 2^647669904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647669904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999697920).

647669904 is an abundant number, since it is smaller than the sum of its proper divisors (1351725936).

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

647669904 is a wasteful number, since it uses less digits than its factorization.

647669904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 51.

The square root of 647669904 is about 25449.3595990155. The cubic root of 647669904 is about 865.2027787040.

The spelling of 647669904 in words is "six hundred forty-seven million, six hundred sixty-nine thousand, nine hundred four".