655580 has 12 divisors (see below), whose sum is σ = 1376760. Its totient is φ = 262224.

The previous prime is 655579. The next prime is 655583. The reversal of 655580 is 85556.

655580 = 108² + 109² + ... + 147².

It is a super-3 number, since 3×655580³ = 845275619163336000, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655583) 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 in 3 ways as a sum of consecutive naturals, for example, 16370 + ... + 16409.

It is an arithmetic number, because the mean of its divisors is an integer number (114730).

2⁶⁵⁵⁵⁸⁰ is an apocalyptic number.

It is an amenable number.

655580 is an abundant number, since it is smaller than the sum of its proper divisors (721180).

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

655580 is a wasteful number, since it uses less digits than its factorization.

655580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32788 (or 32786 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 655580 is about 809.6789487198. The cubic root of 655580 is about 86.8710822380.

The spelling of 655580 in words is "six hundred fifty-five thousand, five hundred eighty".