647336664 has 128 divisors (see below), whose sum is σ = 1945944000. Its totient is φ = 198208512.

The previous prime is 647336621. The next prime is 647336689. The reversal of 647336664 is 466633746.

It is a congruent number.

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, 754924 + ... + 755780.

Almost surely, 2^647336664 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 647336664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972972000).

647336664 is an abundant number, since it is smaller than the sum of its proper divisors (1298607336).

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

647336664 is a wasteful number, since it uses less digits than its factorization.

647336664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 1144 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 45.

The square root of 647336664 is about 25442.8116370813. The cubic root of 647336664 is about 865.0543648102.

The spelling of 647336664 in words is "six hundred forty-seven million, three hundred thirty-six thousand, six hundred sixty-four".