225720872 has 16 divisors (see below), whose sum is σ = 455782740. Its totient is φ = 104178816.

The previous prime is 225720863. The next prime is 225720877. The reversal of 225720872 is 278027522.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 179399236 + 46321636 = 13394^2 + 6806^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (225720877) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1085093 + ... + 1085300.

Almost surely, 2^225720872 is an apocalyptic number.

It is an amenable number.

225720872 is an abundant number, since it is smaller than the sum of its proper divisors (230061868).

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

225720872 is a wasteful number, since it uses less digits than its factorization.

225720872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170412 (or 2170408 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 225720872 is about 15024.0098509020. The cubic root of 225720872 is about 608.8690610360.

The spelling of 225720872 in words is "two hundred twenty-five million, seven hundred twenty thousand, eight hundred seventy-two".