225781216 has 24 divisors (see below), whose sum is σ = 470655360. Its totient is φ = 106249728.

The previous prime is 225781201. The next prime is 225781247. The reversal of 225781216 is 612187522.

It is a happy number.

225781216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

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, 206976 + ... + 208063.

It is an arithmetic number, because the mean of its divisors is an integer number (19610640).

Almost surely, 2^225781216 is an apocalyptic number.

It is an amenable number.

225781216 is an abundant number, since it is smaller than the sum of its proper divisors (244874144).

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

225781216 is a wasteful number, since it uses less digits than its factorization.

225781216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415066 (or 415058 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 225781216 is about 15026.0179688432. The cubic root of 225781216 is about 608.9233143573.

The spelling of 225781216 in words is "two hundred twenty-five million, seven hundred eighty-one thousand, two hundred sixteen".