647604 has 18 divisors (see below), whose sum is σ = 1637090. Its totient is φ = 215856.

The previous prime is 647593. The next prime is 647609. The reversal of 647604 is 406746.

647604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 39204 = 780^2 + 198^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647604.

It is not an unprimeable number, because it can be changed into a prime (647609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8959 + ... + 9030.

2⁶⁴⁷⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

647604 is an abundant number, since it is smaller than the sum of its proper divisors (989486).

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

647604 is a wasteful number, since it uses less digits than its factorization.

647604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17999 (or 17994 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 647604 is about 804.7384668325. The cubic root of 647604 is about 86.5173431317.

The spelling of 647604 in words is "six hundred forty-seven thousand, six hundred four".