655988 has 6 divisors (see below), whose sum is σ = 1147986. Its totient is φ = 327992.

The previous prime is 655987. The next prime is 656023. The reversal of 655988 is 889556.

It can be written as a sum of positive squares in only one way, i.e., 446224 + 209764 = 668^2 + 458^2 .

It is a super-2 number, since 2×655988² = 860640512288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655987) 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 as a sum of consecutive naturals, namely, 81995 + ... + 82002.

It is an arithmetic number, because the mean of its divisors is an integer number (191331).

2⁶⁵⁵⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

655988 is a deficient number, since it is larger than the sum of its proper divisors (491998).

655988 is a wasteful number, since it uses less digits than its factorization.

655988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164001 (or 163999 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The square root of 655988 is about 809.9308612468. The cubic root of 655988 is about 86.8890998973.

The spelling of 655988 in words is "six hundred fifty-five thousand, nine hundred eighty-eight".