655860 has 48 divisors (see below), whose sum is σ = 1947456. Its totient is φ = 164352.

The previous prime is 655859. The next prime is 655883. The reversal of 655860 is 68556.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 699 + ... + 1341.

It is an arithmetic number, because the mean of its divisors is an integer number (40572).

655860 is a Friedman number, since it can be written as 85*(6^5-60), using all its digits and the basic arithmetic operations.

2⁶⁵⁵⁸⁶⁰ is an apocalyptic number.

655860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973728).

655860 is an abundant number, since it is smaller than the sum of its proper divisors (1291596).

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

655860 is a wasteful number, since it uses less digits than its factorization.

655860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 655860 is about 809.8518383013. The cubic root of 655860 is about 86.8834481028.

The spelling of 655860 in words is "six hundred fifty-five thousand, eight hundred sixty".