647085644 has 12 divisors (see below), whose sum is σ = 1132635168. Its totient is φ = 323475600.

The previous prime is 647085643. The next prime is 647085683. The reversal of 647085644 is 446580746.

647085644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 647085595 and 647085604.

It is not an unprimeable number, because it can be changed into a prime (647085643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9389 + ... + 37179.

It is an arithmetic number, because the mean of its divisors is an integer number (94386264).

Almost surely, 2^647085644 is an apocalyptic number.

It is an amenable number.

647085644 is a deficient number, since it is larger than the sum of its proper divisors (485549524).

647085644 is a wasteful number, since it uses less digits than its factorization.

647085644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33616 (or 33614 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 44.

The square root of 647085644 is about 25437.8781347816. The cubic root of 647085644 is about 864.9425353029.

The spelling of 647085644 in words is "six hundred forty-seven million, eighty-five thousand, six hundred forty-four".