647087764 has 12 divisors (see below), whose sum is σ = 1132583284. Its totient is φ = 323492544.

The previous prime is 647087747. The next prime is 647087801. The reversal of 647087764 is 467780746.

It can be written as a sum of positive squares in 2 ways, for example, as 36602500 + 610485264 = 6050^2 + 24708^2 .

It is a congruent number.

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, 37174 + ... + 51730.

Almost surely, 2^647087764 is an apocalyptic number.

It is an amenable number.

647087764 is a deficient number, since it is larger than the sum of its proper divisors (485495520).

647087764 is a wasteful number, since it uses less digits than its factorization.

647087764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25674 (or 25672 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 49.

The square root of 647087764 is about 25437.9198048897. The cubic root of 647087764 is about 864.9434798848.

The spelling of 647087764 in words is "six hundred forty-seven million, eighty-seven thousand, seven hundred sixty-four".