228128356 has 12 divisors (see below), whose sum is σ = 399330540. Its totient is φ = 114033920.

The previous prime is 228128317. The next prime is 228128357. The reversal of 228128356 is 653821822.

It can be written as a sum of positive squares in 2 ways, for example, as 60840000 + 167288356 = 7800^2 + 12934^2 .

It is a super-2 number, since 2×228128356² = 104085093622525472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228128357) 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, 24480 + ... + 32488.

It is an arithmetic number, because the mean of its divisors is an integer number (33277545).

Almost surely, 2^228128356 is an apocalyptic number.

It is an amenable number.

228128356 is a deficient number, since it is larger than the sum of its proper divisors (171202184).

228128356 is a wasteful number, since it uses less digits than its factorization.

228128356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15134 (or 15132 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 228128356 is about 15103.9185643991. The cubic root of 228128356 is about 611.0260934977.

It can be divided in two parts, 228128 and 356, that added together give a square (228484 = 478²).

The spelling of 228128356 in words is "two hundred twenty-eight million, one hundred twenty-eight thousand, three hundred fifty-six".