647979544 has 16 divisors (see below), whose sum is σ = 1223118000. Its totient is φ = 321814752.

The previous prime is 647979517. The next prime is 647979547. The reversal of 647979544 is 445979746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647979547) 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, 270612 + ... + 272995.

It is an arithmetic number, because the mean of its divisors is an integer number (76444875).

Almost surely, 2^647979544 is an apocalyptic number.

It is an amenable number.

647979544 is a deficient number, since it is larger than the sum of its proper divisors (575138456).

647979544 is a wasteful number, since it uses less digits than its factorization.

647979544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543762 (or 543758 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 55.

The square root of 647979544 is about 25455.4423257582. The cubic root of 647979544 is about 865.3406363302.

The spelling of 647979544 in words is "six hundred forty-seven million, nine hundred seventy-nine thousand, five hundred forty-four".