225581690 has 16 divisors (see below), whose sum is σ = 406433160. Its totient is φ = 90146880.

The previous prime is 225581689. The next prime is 225581693. The reversal of 225581690 is 96185522.

225581690 is digitally balanced in base 3, 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 4 ways, for example, as 125641681 + 99940009 = 11209^2 + 9997^2 .

It is a super-2 number, since 2×225581690² = 101774197726512200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (225581693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920 + ... + 21260.

Almost surely, 2^225581690 is an apocalyptic number.

225581690 is a deficient number, since it is larger than the sum of its proper divisors (180851470).

225581690 is a wasteful number, since it uses less digits than its factorization.

225581690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21457.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 225581690 is about 15019.3771508675. The cubic root of 225581690 is about 608.7438901604.

The spelling of 225581690 in words is "two hundred twenty-five million, five hundred eighty-one thousand, six hundred ninety".