647695760 has 20 divisors (see below), whose sum is σ = 1505892828. Its totient is φ = 259078272.

The previous prime is 647695759. The next prime is 647695781. The reversal of 647695760 is 67596746.

It can be written as a sum of positive squares in 2 ways, for example, as 173501584 + 474194176 = 13172^2 + 21776^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 647695699 and 647695708.

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 3 ways as a sum of consecutive naturals, for example, 4048019 + ... + 4048178.

Almost surely, 2^647695760 is an apocalyptic number.

It is an amenable number.

647695760 is an abundant number, since it is smaller than the sum of its proper divisors (858197068).

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

647695760 is a wasteful number, since it uses less digits than its factorization.

647695760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8096210 (or 8096204 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 50.

The square root of 647695760 is about 25449.8675831526. The cubic root of 647695760 is about 865.2142919688.

The spelling of 647695760 in words is "six hundred forty-seven million, six hundred ninety-five thousand, seven hundred sixty".