225128112 has 80 divisors (see below), whose sum is σ = 667873920. Its totient is φ = 64627200.

The previous prime is 225128087. The next prime is 225128119. The reversal of 225128112 is 211821522.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (225128119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1189 + ... + 21252.

It is an arithmetic number, because the mean of its divisors is an integer number (8348424).

Almost surely, 2^225128112 is an apocalyptic number.

225128112 is a gapful number since it is divisible by the number (22) 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 225128112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333936960).

225128112 is an abundant number, since it is smaller than the sum of its proper divisors (442745808).

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

225128112 is a wasteful number, since it uses less digits than its factorization.

225128112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22482 (or 22476 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

The square root of 225128112 is about 15004.2697922958. The cubic root of 225128112 is about 608.3356151454.

Adding to 225128112 its reverse (211821522), we get a palindrome (436949634).

The spelling of 225128112 in words is "two hundred twenty-five million, one hundred twenty-eight thousand, one hundred twelve".