647969960 has 64 divisors (see below), whose sum is σ = 1684048320. Its totient is φ = 221762560.

The previous prime is 647969957. The next prime is 647969981. The reversal of 647969960 is 69969746.

It is a junction number, because it is equal to n+sod(n) for n = 647969896 and 647969905.

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, 35834 + ... + 50793.

It is an arithmetic number, because the mean of its divisors is an integer number (26313255).

Almost surely, 2^647969960 is an apocalyptic number.

It is an amenable number.

647969960 is an abundant number, since it is smaller than the sum of its proper divisors (1036078360).

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

647969960 is a wasteful number, since it uses less digits than its factorization.

647969960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86666 (or 86662 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 56.

The square root of 647969960 is about 25455.2540745521. The cubic root of 647969960 is about 865.3363700096.

The spelling of 647969960 in words is "six hundred forty-seven million, nine hundred sixty-nine thousand, nine hundred sixty".