255557220 has 96 divisors (see below), whose sum is σ = 756497280. Its totient is φ = 64281600.

The previous prime is 255557219. The next prime is 255557231. The reversal of 255557220 is 22755552.

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, 424920 + ... + 425520.

It is an arithmetic number, because the mean of its divisors is an integer number (7880180).

Almost surely, 2^255557220 is an apocalyptic number.

255557220 is a gapful number since it is divisible by the number (20) 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 255557220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378248640).

255557220 is an abundant number, since it is smaller than the sum of its proper divisors (500940060).

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

255557220 is a wasteful number, since it uses less digits than its factorization.

255557220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 35000, while the sum is 33.

The square root of 255557220 is about 15986.1571367230. The cubic root of 255557220 is about 634.5941316948.

The spelling of 255557220 in words is "two hundred fifty-five million, five hundred fifty-seven thousand, two hundred twenty".