225631240 has 16 divisors (see below), whose sum is σ = 507670380. Its totient is φ = 90252480.

The previous prime is 225631187. The next prime is 225631249. The reversal of 225631240 is 42136522.

It can be written as a sum of positive squares in 2 ways, for example, as 209033764 + 16597476 = 14458^2 + 4074^2 .

It is not an unprimeable number, because it can be changed into a prime (225631249) 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, 2820351 + ... + 2820430.

Almost surely, 2^225631240 is an apocalyptic number.

225631240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225631240 is an abundant number, since it is smaller than the sum of its proper divisors (282039140).

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

225631240 is a wasteful number, since it uses less digits than its factorization.

225631240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5640792 (or 5640788 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 225631240 is about 15021.0265960752. The cubic root of 225631240 is about 608.7884579790.

Adding to 225631240 its reverse (42136522), we get a palindrome (267767762).

The spelling of 225631240 in words is "two hundred twenty-five million, six hundred thirty-one thousand, two hundred forty".