647427564 has 36 divisors (see below), whose sum is σ = 1870347024. Its totient is φ = 184979232.

The previous prime is 647427551. The next prime is 647427589. The reversal of 647427564 is 465724746.

647427564 is a `hidden beast` number, since 6 + 47 + 42 + 7 + 564 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1284327 + ... + 1284830.

It is an arithmetic number, because the mean of its divisors is an integer number (51954084).

Almost surely, 2^647427564 is an apocalyptic number.

It is an amenable number.

647427564 is an abundant number, since it is smaller than the sum of its proper divisors (1222919460).

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

647427564 is a wasteful number, since it uses less digits than its factorization.

647427564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569174 (or 2569169 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 45.

The square root of 647427564 is about 25444.5979335497. The cubic root of 647427564 is about 865.0948536654.

The spelling of 647427564 in words is "six hundred forty-seven million, four hundred twenty-seven thousand, five hundred sixty-four".