228728018 has 4 divisors (see below), whose sum is σ = 343092030. Its totient is φ = 114364008.

The previous prime is 228727987. The next prime is 228728021. The reversal of 228728018 is 810827822.

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

It can be written as a sum of positive squares in only one way, i.e., 200137609 + 28590409 = 14147^2 + 5347^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57182003 + ... + 57182006.

Almost surely, 2^228728018 is an apocalyptic number.

228728018 is a deficient number, since it is larger than the sum of its proper divisors (114364012).

228728018 is a wasteful number, since it uses less digits than its factorization.

228728018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114364011.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 228728018 is about 15123.7567422912. The cubic root of 228728018 is about 611.5610095336.

The spelling of 228728018 in words is "two hundred twenty-eight million, seven hundred twenty-eight thousand, eighteen".