655604 has 6 divisors (see below), whose sum is σ = 1147314. Its totient is φ = 327800.

The previous prime is 655601. The next prime is 655637. The reversal of 655604 is 406556.

It can be written as a sum of positive squares in only one way, i.e., 559504 + 96100 = 748^2 + 310^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81947 + ... + 81954.

It is an arithmetic number, because the mean of its divisors is an integer number (191219).

2⁶⁵⁵⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

655604 is a deficient number, since it is larger than the sum of its proper divisors (491710).

655604 is a wasteful number, since it uses less digits than its factorization.

655604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163905 (or 163903 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 655604 is about 809.6937692733. The cubic root of 655604 is about 86.8721423072.

The spelling of 655604 in words is "six hundred fifty-five thousand, six hundred four".