647404764 has 12 divisors (see below), whose sum is σ = 1510611144. Its totient is φ = 215801584.

The previous prime is 647404757. The next prime is 647404777. The reversal of 647404764 is 467404746.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26975187 + ... + 26975210.

It is an arithmetic number, because the mean of its divisors is an integer number (125884262).

Almost surely, 2^647404764 is an apocalyptic number.

It is an amenable number.

647404764 is an abundant number, since it is smaller than the sum of its proper divisors (863206380).

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

647404764 is a wasteful number, since it uses less digits than its factorization.

647404764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53950404 (or 53950402 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 42.

The square root of 647404764 is about 25444.1498973733. The cubic root of 647404764 is about 865.0846984010.

The spelling of 647404764 in words is "six hundred forty-seven million, four hundred four thousand, seven hundred sixty-four".