228508281 has 24 divisors (see below), whose sum is σ = 339633216. Its totient is φ = 147981600.

The previous prime is 228508279. The next prime is 228508303. The reversal of 228508281 is 182805822.

It is a happy number.

It is not a de Polignac number, because 228508281 - 2¹ = 228508279 is a prime.

It is a super-2 number, since 2×228508281² = 104432068971149922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228518281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46806 + ... + 51456.

It is an arithmetic number, because the mean of its divisors is an integer number (14151384).

Almost surely, 2^228508281 is an apocalyptic number.

It is an amenable number.

228508281 is a deficient number, since it is larger than the sum of its proper divisors (111124935).

228508281 is a wasteful number, since it uses less digits than its factorization.

228508281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813 (or 4810 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 228508281 is about 15116.4903664839. The cubic root of 228508281 is about 611.3651063540.

The spelling of 228508281 in words is "two hundred twenty-eight million, five hundred eight thousand, two hundred eighty-one".