255521500 has 96 divisors (see below), whose sum is σ = 632923200. Its totient is φ = 89337600.

The previous prime is 255521489. The next prime is 255521503. The reversal of 255521500 is 5125552.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255521503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122466 + ... + 124534.

It is an arithmetic number, because the mean of its divisors is an integer number (6592950).

Almost surely, 2^255521500 is an apocalyptic number.

255521500 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 255521500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316461600).

255521500 is an abundant number, since it is smaller than the sum of its proper divisors (377401700).

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

255521500 is a wasteful number, since it uses less digits than its factorization.

255521500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120 (or 2108 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 255521500 is about 15985.0398810888. The cubic root of 255521500 is about 634.5645639414.

The spelling of 255521500 in words is "two hundred fifty-five million, five hundred twenty-one thousand, five hundred".