225781416 has 72 divisors (see below), whose sum is σ = 711337770. Its totient is φ = 64507968.

The previous prime is 225781397. The next prime is 225781417. The reversal of 225781416 is 614187522.

225781416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 164096100 + 61685316 = 12810^2 + 7854^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (225781417) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 28471 + ... + 35526.

Almost surely, 2^225781416 is an apocalyptic number.

It is an amenable number.

225781416 is an abundant number, since it is smaller than the sum of its proper divisors (485556354).

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

225781416 is a wasteful number, since it uses less digits than its factorization.

225781416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64023 (or 64009 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 225781416 is about 15026.0246239649. The cubic root of 225781416 is about 608.9234941547.

The spelling of 225781416 in words is "two hundred twenty-five million, seven hundred eighty-one thousand, four hundred sixteen".