252521660 has 48 divisors (see below), whose sum is σ = 555663360. Its totient is φ = 96275520.

The previous prime is 252521657. The next prime is 252521693. The reversal of 252521660 is 66125252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38501 + ... + 44579.

It is an arithmetic number, because the mean of its divisors is an integer number (11576320).

Almost surely, 2^252521660 is an apocalyptic number.

252521660 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 252521660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277831680).

252521660 is an abundant number, since it is smaller than the sum of its proper divisors (303141700).

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

252521660 is a wasteful number, since it uses less digits than its factorization.

252521660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6186 (or 6184 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 252521660 is about 15890.9301175230. The cubic root of 252521660 is about 632.0715048883.

The spelling of 252521660 in words is "two hundred fifty-two million, five hundred twenty-one thousand, six hundred sixty".