647385660 has 36 divisors (see below), whose sum is σ = 1963737048. Its totient is φ = 172636128.

The previous prime is 647385637. The next prime is 647385671. The reversal of 647385660 is 66583746.

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

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 1798114 + ... + 1798473.

Almost surely, 2^647385660 is an apocalyptic number.

647385660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647385660 is an abundant number, since it is smaller than the sum of its proper divisors (1316351388).

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

647385660 is a wasteful number, since it uses less digits than its factorization.

647385660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3596602 (or 3596597 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 647385660 is about 25443.7744841444. The cubic root of 647385660 is about 865.0761891749.

The spelling of 647385660 in words is "six hundred forty-seven million, three hundred eighty-five thousand, six hundred sixty".