647628 has 24 divisors (see below), whose sum is σ = 1564080. Its totient is φ = 208320.

The previous prime is 647627. The next prime is 647641. The reversal of 647628 is 826746.

647628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647628.

It is not an unprimeable number, because it can be changed into a prime (647627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583 + ... + 1278.

It is an arithmetic number, because the mean of its divisors is an integer number (65170).

2⁶⁴⁷⁶²⁸ is an apocalyptic number.

It is an amenable number.

647628 is an abundant number, since it is smaller than the sum of its proper divisors (916452).

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

647628 is a wasteful number, since it uses less digits than its factorization.

647628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897 (or 1895 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 647628 is about 804.7533783713. The cubic root of 647628 is about 86.5184118870.

It can be divided in two parts, 647 and 628, that added together give a triangular number (1275 = T₅₀).

The spelling of 647628 in words is "six hundred forty-seven thousand, six hundred twenty-eight".