655872 has 80 divisors (see below), whose sum is σ = 2029632. Its totient is φ = 184320.

The previous prime is 655859. The next prime is 655883. The reversal of 655872 is 278556.

It is a happy number.

655872 is nontrivially palindromic in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10722 + ... + 10782.

2⁶⁵⁵⁸⁷² 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 655872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014816).

655872 is an abundant number, since it is smaller than the sum of its proper divisors (1373760).

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

655872 is an equidigital number, since it uses as much as digits as its factorization.

655872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 73 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 655872 is about 809.8592470300. The cubic root of 655872 is about 86.8839779897.

The spelling of 655872 in words is "six hundred fifty-five thousand, eight hundred seventy-two".