655644228 has 24 divisors (see below), whose sum is σ = 1533883680. Its totient is φ = 217969920.

The previous prime is 655644217. The next prime is 655644239. The reversal of 655644228 is 822446556.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (655644217) and next prime (655644239).

It is a self number, because there is not a number n which added to its sum of digits gives 655644228.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67533 + ... + 76628.

It is an arithmetic number, because the mean of its divisors is an integer number (63911820).

Almost surely, 2^655644228 is an apocalyptic number.

It is an amenable number.

655644228 is an abundant number, since it is smaller than the sum of its proper divisors (878239452).

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

655644228 is a wasteful number, since it uses less digits than its factorization.

655644228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144547 (or 144545 counting only the distinct ones).

The product of its digits is 460800, while the sum is 42.

The square root of 655644228 is about 25605.5507263562. The cubic root of 655644228 is about 868.7391910185.

The spelling of 655644228 in words is "six hundred fifty-five million, six hundred forty-four thousand, two hundred twenty-eight".