647336660 has 12 divisors (see below), whose sum is σ = 1359407028. Its totient is φ = 258934656.

The previous prime is 647336621. The next prime is 647336689. The reversal of 647336660 is 66633746.

It can be written as a sum of positive squares in 2 ways, for example, as 336942736 + 310393924 = 18356^2 + 17618^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16183397 + ... + 16183436.

It is an arithmetic number, because the mean of its divisors is an integer number (113283919).

Almost surely, 2^647336660 is an apocalyptic number.

It is an amenable number.

647336660 is an abundant number, since it is smaller than the sum of its proper divisors (712070368).

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

647336660 is a wasteful number, since it uses less digits than its factorization.

647336660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32366842 (or 32366840 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 41.

The square root of 647336660 is about 25442.8115584736. The cubic root of 647336660 is about 865.0543630284.

The spelling of 647336660 in words is "six hundred forty-seven million, three hundred thirty-six thousand, six hundred sixty".