228988033 has 4 divisors (see below), whose sum is σ = 229022980. Its totient is φ = 228953088.

The previous prime is 228988021. The next prime is 228988061. The reversal of 228988033 is 330889822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85155984 + 143832049 = 9228^2 + 11993^2 .

It is a 3-Lehmer number, since φ(228988033) divides (228988033-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228988033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228988003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4368 + ... + 21841.

It is an arithmetic number, because the mean of its divisors is an integer number (57255745).

It is a Poulet number, since it divides 2^228988032-1.

Almost surely, 2^228988033 is an apocalyptic number.

228988033 is the 8737-th octagonal number.

It is an amenable number.

228988033 is a deficient number, since it is larger than the sum of its proper divisors (34947).

228988033 is an equidigital number, since it uses as much as digits as its factorization.

228988033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34946.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 228988033 is about 15132.3505444462. The cubic root of 228988033 is about 611.7926599451.

The spelling of 228988033 in words is "two hundred twenty-eight million, nine hundred eighty-eight thousand, thirty-three".