228138272 has 12 divisors (see below), whose sum is σ = 449147286. Its totient is φ = 114069120.

The previous prime is 228138271. The next prime is 228138289. The reversal of 228138272 is 272831822.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 132802576 + 95335696 = 11524^2 + 9764^2 .

It is a super-2 number, since 2×228138272² = 104094142302291968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (228138271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564629 + ... + 3564692.

Almost surely, 2^228138272 is an apocalyptic number.

It is an amenable number.

228138272 is a deficient number, since it is larger than the sum of its proper divisors (221009014).

228138272 is an equidigital number, since it uses as much as digits as its factorization.

228138272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129331 (or 7129323 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 228138272 is about 15104.2468200172. The cubic root of 228138272 is about 611.0349464772.

The spelling of 228138272 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, two hundred seventy-two".