225890988 has 12 divisors (see below), whose sum is σ = 527079000. Its totient is φ = 75296992.

The previous prime is 225890983. The next prime is 225890993. The reversal of 225890988 is 889098522.

It is an interprime number because it is at equal distance from previous prime (225890983) and next prime (225890993).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×225890988² = 102053476919232288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 225890988.

It is not an unprimeable number, because it can be changed into a prime (225890983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9412113 + ... + 9412136.

It is an arithmetic number, because the mean of its divisors is an integer number (43923250).

Almost surely, 2^225890988 is an apocalyptic number.

It is an amenable number.

225890988 is an abundant number, since it is smaller than the sum of its proper divisors (301188012).

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

225890988 is a wasteful number, since it uses less digits than its factorization.

225890988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18824256 (or 18824254 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The square root of 225890988 is about 15029.6702558639. The cubic root of 225890988 is about 609.0219819989.

The spelling of 225890988 in words is "two hundred twenty-five million, eight hundred ninety thousand, nine hundred eighty-eight".