655880 has 32 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 248256.

The previous prime is 655859. The next prime is 655883. The reversal of 655880 is 88556.

655880 = 78² + 79² + ... + 134².

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655880.

It is not an unprimeable number, because it can be changed into a prime (655883) 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, 329 + ... + 1191.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁶⁵⁵⁸⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777600).

655880 is an abundant number, since it is smaller than the sum of its proper divisors (899320).

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

655880 is a wasteful number, since it uses less digits than its factorization.

655880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 889 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 655880 is about 809.8641861448. The cubic root of 655880 is about 86.8843312441.

The spelling of 655880 in words is "six hundred fifty-five thousand, eight hundred eighty".