635604 has 12 divisors (see below), whose sum is σ = 1483104. Its totient is φ = 211864.

The previous prime is 635603. The next prime is 635617. The reversal of 635604 is 406536.

635604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26472 + ... + 26495.

It is an arithmetic number, because the mean of its divisors is an integer number (123592).

2⁶³⁵⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

635604 is an abundant number, since it is smaller than the sum of its proper divisors (847500).

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

635604 is a wasteful number, since it uses less digits than its factorization.

635604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52974 (or 52972 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 635604 is about 797.2477657542. The cubic root of 635604 is about 85.9796238007.

Adding to 635604 its sum of digits (24), we get a triangular number (635628 = T₁₁₂₇).

The spelling of 635604 in words is "six hundred thirty-five thousand, six hundred four".