655508 has 24 divisors (see below), whose sum is σ = 1345344. Its totient is φ = 273600.

The previous prime is 655507. The next prime is 655511. The reversal of 655508 is 805556.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 863 + ... + 1433.

It is an arithmetic number, because the mean of its divisors is an integer number (56056).

2⁶⁵⁵⁵⁰⁸ 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 655508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (672672).

655508 is an abundant number, since it is smaller than the sum of its proper divisors (689836).

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

655508 is a wasteful number, since it uses less digits than its factorization.

655508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 621 counting only the distinct ones).

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

The square root of 655508 is about 809.6344854315. The cubic root of 655508 is about 86.8679018751.

The spelling of 655508 in words is "six hundred fifty-five thousand, five hundred eight".