225257220 has 192 divisors, whose sum is σ = 731808000. Its totient is φ = 57480192.

The previous prime is 225257209. The next prime is 225257243. The reversal of 225257220 is 22752522.

225257220 is a `hidden beast` number, since 22 + 52 + 572 + 20 = 666.

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

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 2066526 + ... + 2066634.

It is an arithmetic number, because the mean of its divisors is an integer number (3811500).

Almost surely, 2^225257220 is an apocalyptic number.

225257220 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 225257220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365904000).

225257220 is an abundant number, since it is smaller than the sum of its proper divisors (506550780).

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

225257220 is a wasteful number, since it uses less digits than its factorization.

225257220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 225257220 is about 15008.5715509505. The cubic root of 225257220 is about 608.4518837367.

The spelling of 225257220 in words is "two hundred twenty-five million, two hundred fifty-seven thousand, two hundred twenty".