647568628 has 48 divisors (see below), whose sum is σ = 1334672640. Its totient is φ = 269178624.

The previous prime is 647568599. The next prime is 647568629. The reversal of 647568628 is 826865746.

647568628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (52) 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 (647568629) 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, 129625 + ... + 134527.

It is an arithmetic number, because the mean of its divisors is an integer number (27805680).

Almost surely, 2^647568628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647568628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (667336320).

647568628 is an abundant number, since it is smaller than the sum of its proper divisors (687104012).

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

647568628 is a wasteful number, since it uses less digits than its factorization.

647568628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5056 (or 5054 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 52.

The square root of 647568628 is about 25447.3697658520. The cubic root of 647568628 is about 865.1576791639.

The spelling of 647568628 in words is "six hundred forty-seven million, five hundred sixty-eight thousand, six hundred twenty-eight".