225521440 has 48 divisors (see below), whose sum is σ = 555968448. Its totient is φ = 86285056.

The previous prime is 225521437. The next prime is 225521447. The reversal of 225521440 is 44125522.

It is not an unprimeable number, because it can be changed into a prime (225521447) 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 7 ways as a sum of consecutive naturals, for example, 26962 + ... + 34321.

It is an arithmetic number, because the mean of its divisors is an integer number (11582676).

Almost surely, 2^225521440 is an apocalyptic number.

225521440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225521440 is an abundant number, since it is smaller than the sum of its proper divisors (330447008).

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

225521440 is a wasteful number, since it uses less digits than its factorization.

225521440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61321 (or 61313 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 225521440 is about 15017.3712746273. The cubic root of 225521440 is about 608.6896894181.

Adding to 225521440 its reverse (44125522), we get a palindrome (269646962).

The spelling of 225521440 in words is "two hundred twenty-five million, five hundred twenty-one thousand, four hundred forty".