647644404 has 48 divisors (see below), whose sum is σ = 1652152320. Its totient is φ = 195827040.

The previous prime is 647644399. The next prime is 647644409. The reversal of 647644404 is 404446746.

It is an interprime number because it is at equal distance from previous prime (647644399) and next prime (647644409).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647644409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58107 + ... + 68349.

It is an arithmetic number, because the mean of its divisors is an integer number (34419840).

Almost surely, 2^647644404 is an apocalyptic number.

It is an amenable number.

647644404 is an abundant number, since it is smaller than the sum of its proper divisors (1004507916).

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

647644404 is a wasteful number, since it uses less digits than its factorization.

647644404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10740 (or 10738 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 39.

The square root of 647644404 is about 25448.8585991592. The cubic root of 647644404 is about 865.1914236602.

The spelling of 647644404 in words is "six hundred forty-seven million, six hundred forty-four thousand, four hundred four".