647705540 has 24 divisors (see below), whose sum is σ = 1383238080. Its totient is φ = 254690528.

The previous prime is 647705521. The next prime is 647705563. The reversal of 647705540 is 45507746.

647705540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 647705494 and 647705503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273272 + ... + 275631.

It is an arithmetic number, because the mean of its divisors is an integer number (57634920).

Almost surely, 2^647705540 is an apocalyptic number.

It is an amenable number.

647705540 is an abundant number, since it is smaller than the sum of its proper divisors (735532540).

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

647705540 is a wasteful number, since it uses less digits than its factorization.

647705540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548971 (or 548969 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 38.

The square root of 647705540 is about 25450.0597248808. The cubic root of 647705540 is about 865.2186467671.

The spelling of 647705540 in words is "six hundred forty-seven million, seven hundred five thousand, five hundred forty".