228687220 has 12 divisors (see below), whose sum is σ = 480243204. Its totient is φ = 91474880.

The previous prime is 228687203. The next prime is 228687223. The reversal of 228687220 is 22786822.

It can be written as a sum of positive squares in 2 ways, for example, as 37307664 + 191379556 = 6108^2 + 13834^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 228687220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228687223) 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, 5717161 + ... + 5717200.

It is an arithmetic number, because the mean of its divisors is an integer number (40020267).

Almost surely, 2^228687220 is an apocalyptic number.

228687220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228687220 is an abundant number, since it is smaller than the sum of its proper divisors (251555984).

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

228687220 is a wasteful number, since it uses less digits than its factorization.

228687220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11434370 (or 11434368 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 228687220 is about 15122.4078770545. The cubic root of 228687220 is about 611.5246461854.

The spelling of 228687220 in words is "two hundred twenty-eight million, six hundred eighty-seven thousand, two hundred twenty".