655564 has 24 divisors (see below), whose sum is σ = 1412768. Its totient is φ = 259200.

The previous prime is 655561. The next prime is 655579. The reversal of 655564 is 465556.

655564 = T₂₉₉ + T₃₀₀ + ... + T₃₁₂.

655564 = 22² + 23² + ... + 125².

It is not an unprimeable number, because it can be changed into a prime (655561) 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, 537 + ... + 1264.

2⁶⁵⁵⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

655564 is an abundant number, since it is smaller than the sum of its proper divisors (757204).

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

655564 is a wasteful number, since it uses less digits than its factorization.

655564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825 (or 1823 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

The square root of 655564 is about 809.6690682001. The cubic root of 655564 is about 86.8703755108.

The spelling of 655564 in words is "six hundred fifty-five thousand, five hundred sixty-four".