228145172 has 6 divisors (see below), whose sum is σ = 399254058. Its totient is φ = 114072584.

The previous prime is 228145123. The next prime is 228145187. The reversal of 228145172 is 271541822.

It can be written as a sum of positive squares in only one way, i.e., 124634896 + 103510276 = 11164^2 + 10174^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28518143 + ... + 28518150.

It is an arithmetic number, because the mean of its divisors is an integer number (66542343).

Almost surely, 2^228145172 is an apocalyptic number.

It is an amenable number.

228145172 is a deficient number, since it is larger than the sum of its proper divisors (171108886).

228145172 is a wasteful number, since it uses less digits than its factorization.

228145172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57036297 (or 57036295 counting only the distinct ones).

The product of its digits is 8960, while the sum is 32.

The square root of 228145172 is about 15104.4752308711. The cubic root of 228145172 is about 611.0411066282.

Adding to 228145172 its reverse (271541822), we get a palindrome (499686994).

The spelling of 228145172 in words is "two hundred twenty-eight million, one hundred forty-five thousand, one hundred seventy-two".