647651560 has 32 divisors (see below), whose sum is σ = 1460252160. Its totient is φ = 258520896.

The previous prime is 647651531. The next prime is 647651581. The reversal of 647651560 is 65156746.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2857 + ... + 36103.

It is an arithmetic number, because the mean of its divisors is an integer number (45632880).

Almost surely, 2^647651560 is an apocalyptic number.

It is an amenable number.

647651560 is an abundant number, since it is smaller than the sum of its proper divisors (812600600).

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

647651560 is a wasteful number, since it uses less digits than its factorization.

647651560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33745 (or 33741 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 647651560 is about 25448.9991944674. Note that the first 3 decimals coincide. The cubic root of 647651560 is about 865.1946102272.

The spelling of 647651560 in words is "six hundred forty-seven million, six hundred fifty-one thousand, five hundred sixty".