225781540 has 12 divisors (see below), whose sum is σ = 474141276. Its totient is φ = 90312608.

The previous prime is 225781529. The next prime is 225781583. The reversal of 225781540 is 45187522.

It is a happy number.

225781540 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 125260864 + 100520676 = 11192^2 + 10026^2 .

It is a junction number, because it is equal to n+sod(n) for n = 225781496 and 225781505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5644519 + ... + 5644558.

It is an arithmetic number, because the mean of its divisors is an integer number (39511773).

Almost surely, 2^225781540 is an apocalyptic number.

225781540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225781540 is an abundant number, since it is smaller than the sum of its proper divisors (248359736).

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

225781540 is a wasteful number, since it uses less digits than its factorization.

225781540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11289086 (or 11289084 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 225781540 is about 15026.0287501389. The cubic root of 225781540 is about 608.9236056290.

The spelling of 225781540 in words is "two hundred twenty-five million, seven hundred eighty-one thousand, five hundred forty".