655219988 has 12 divisors (see below), whose sum is σ = 1152070752. Its totient is φ = 326056920.

The previous prime is 655219987. The next prime is 655220017. The reversal of 655219988 is 889912556.

655219988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655219987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387320 + ... + 389007.

It is an arithmetic number, because the mean of its divisors is an integer number (96005896).

Almost surely, 2^655219988 is an apocalyptic number.

It is an amenable number.

655219988 is a deficient number, since it is larger than the sum of its proper divisors (496850764).

655219988 is a wasteful number, since it uses less digits than its factorization.

655219988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776542 (or 776540 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 53.

The square root of 655219988 is about 25597.2652445530. The cubic root of 655219988 is about 868.5517756392.

The spelling of 655219988 in words is "six hundred fifty-five million, two hundred nineteen thousand, nine hundred eighty-eight".