225218220 has 48 divisors (see below), whose sum is σ = 631262688. Its totient is φ = 59996160.

The previous prime is 225218179. The next prime is 225218221. The reversal of 225218220 is 22812522.

It is not an unprimeable number, because it can be changed into a prime (225218221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110652 + ... + 112668.

It is an arithmetic number, because the mean of its divisors is an integer number (13151306).

Almost surely, 2^225218220 is an apocalyptic number.

225218220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225218220 is an abundant number, since it is smaller than the sum of its proper divisors (406044468).

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

225218220 is a wasteful number, since it uses less digits than its factorization.

225218220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890 (or 3888 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 225218220 is about 15007.2722371522. The cubic root of 225218220 is about 608.4167668555.

The spelling of 225218220 in words is "two hundred twenty-five million, two hundred eighteen thousand, two hundred twenty".