647671764 has 24 divisors (see below), whose sum is σ = 1514852640. Its totient is φ = 215373664.

The previous prime is 647671723. The next prime is 647671771. The reversal of 647671764 is 467176746.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59379 + ... + 69434.

It is an arithmetic number, because the mean of its divisors is an integer number (63118860).

Almost surely, 2^647671764 is an apocalyptic number.

It is an amenable number.

647671764 is an abundant number, since it is smaller than the sum of its proper divisors (867180876).

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

647671764 is a wasteful number, since it uses less digits than its factorization.

647671764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129239 (or 129237 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 48.

The square root of 647671764 is about 25449.3961421484. The cubic root of 647671764 is about 865.2036069426.

The spelling of 647671764 in words is "six hundred forty-seven million, six hundred seventy-one thousand, seven hundred sixty-four".