647404 has 24 divisors (see below), whose sum is σ = 1225728. Its totient is φ = 298320.

The previous prime is 647401. The next prime is 647417. The reversal of 647404 is 404746.

It is a happy number.

647404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (647401) 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, 2739 + ... + 2965.

It is an arithmetic number, because the mean of its divisors is an integer number (51072).

2⁶⁴⁷⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

647404 is a deficient number, since it is larger than the sum of its proper divisors (578324).

647404 is a wasteful number, since it uses less digits than its factorization.

647404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 647404 is about 804.6141932628. The cubic root of 647404 is about 86.5084358106.

The spelling of 647404 in words is "six hundred forty-seven thousand, four hundred four".