655205220 has 96 divisors (see below), whose sum is σ = 2047933440. Its totient is φ = 173905920.

The previous prime is 655205219. The next prime is 655205251. The reversal of 655205220 is 22502556.

655205220 is a `hidden beast` number, since 655 + 2 + 0 + 5 + 2 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117700 + ... + 123140.

It is an arithmetic number, because the mean of its divisors is an integer number (21332640).

Almost surely, 2^655205220 is an apocalyptic number.

655205220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655205220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023966720).

655205220 is an abundant number, since it is smaller than the sum of its proper divisors (1392728220).

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

655205220 is a wasteful number, since it uses less digits than its factorization.

655205220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5682 (or 5674 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 655205220 is about 25596.9767746115. The cubic root of 655205220 is about 868.5452501622.

Adding to 655205220 its reverse (22502556), we get a palindrome (677707776).

The spelling of 655205220 in words is "six hundred fifty-five million, two hundred five thousand, two hundred twenty".