225798660 has 144 divisors (see below), whose sum is σ = 729106560. Its totient is φ = 56401920.

The previous prime is 225798649. The next prime is 225798691. The reversal of 225798660 is 66897522.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 351940 + ... + 352580.

It is an arithmetic number, because the mean of its divisors is an integer number (5063240).

Almost surely, 2^225798660 is an apocalyptic number.

225798660 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 225798660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364553280).

225798660 is an abundant number, since it is smaller than the sum of its proper divisors (503307900).

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

225798660 is a wasteful number, since it uses less digits than its factorization.

225798660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 773 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 225798660 is about 15026.5984174729. The cubic root of 225798660 is about 608.9389958873.

The spelling of 225798660 in words is "two hundred twenty-five million, seven hundred ninety-eight thousand, six hundred sixty".