647249860 has 12 divisors (see below), whose sum is σ = 1359224748. Its totient is φ = 258899936.

The previous prime is 647249851. The next prime is 647249861. The reversal of 647249860 is 68942746.

It is a happy number.

647249860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 400320064 + 246929796 = 20008^2 + 15714^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 647249860.

It is not an unprimeable number, because it can be changed into a prime (647249861) 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, 16181227 + ... + 16181266.

It is an arithmetic number, because the mean of its divisors is an integer number (113268729).

Almost surely, 2^647249860 is an apocalyptic number.

It is an amenable number.

647249860 is an abundant number, since it is smaller than the sum of its proper divisors (711974888).

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

647249860 is a wasteful number, since it uses less digits than its factorization.

647249860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32362502 (or 32362500 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 647249860 is about 25441.1057149645. The cubic root of 647249860 is about 865.0156968651.

The spelling of 647249860 in words is "six hundred forty-seven million, two hundred forty-nine thousand, eight hundred sixty".