647481764 has 12 divisors (see below), whose sum is σ = 1145825100. Its totient is φ = 320103168.

The previous prime is 647481739. The next prime is 647481767. The reversal of 647481764 is 467184746.

647481764 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 54169600 + 593312164 = 7360^2 + 24358^2 .

It is not an unprimeable number, because it can be changed into a prime (647481767) 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, 909029 + ... + 909740.

It is an arithmetic number, because the mean of its divisors is an integer number (95485425).

Almost surely, 2^647481764 is an apocalyptic number.

It is an amenable number.

647481764 is a deficient number, since it is larger than the sum of its proper divisors (498343336).

647481764 is a wasteful number, since it uses less digits than its factorization.

647481764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818862 (or 1818860 counting only the distinct ones).

The product of its digits is 903168, while the sum is 47.

The square root of 647481764 is about 25445.6629703374. The cubic root of 647481764 is about 865.1189937316.

The spelling of 647481764 in words is "six hundred forty-seven million, four hundred eighty-one thousand, seven hundred sixty-four".