228281881 has 9 divisors (see below), whose sum is σ = 236879773. Its totient is φ = 219987040.

The previous prime is 228281849. The next prime is 228281909. The reversal of 228281881 is 188182822.

The square root of 228281881 is 15109.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 8649481 + 219632400 = 2941^2 + 14820^2 .

It is not a de Polignac number, because 228281881 - 2⁵ = 228281849 is a prime.

It is a super-2 number, since 2×228281881² = 104225234385796322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228287881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 437901 + ... + 438421.

Almost surely, 2^228281881 is an apocalyptic number.

228281881 is the 15109-th square number.

228281881 is the 7555-th centered octagonal number.

It is an amenable number.

228281881 is a deficient number, since it is larger than the sum of its proper divisors (8597892).

228281881 is an frugal number, since it uses more digits than its factorization.

228281881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100 (or 550 counting only the distinct ones).

The product of its digits is 32768, while the sum is 40.

The cubic root of 228281881 is about 611.1631314750.

The spelling of 228281881 in words is "two hundred twenty-eight million, two hundred eighty-one thousand, eight hundred eighty-one".