228521138 has 8 divisors (see below), whose sum is σ = 343075500. Its totient is φ = 114162640.

The previous prime is 228521129. The next prime is 228521159. The reversal of 228521138 is 831125822.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 180176929 + 48344209 = 13423^2 + 6953^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46013 + ... + 50736.

Almost surely, 2^228521138 is an apocalyptic number.

228521138 is a deficient number, since it is larger than the sum of its proper divisors (114554362).

228521138 is a wasteful number, since it uses less digits than its factorization.

228521138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97932.

The product of its digits is 7680, while the sum is 32.

The square root of 228521138 is about 15116.9156245578. The cubic root of 228521138 is about 611.3765722751.

The spelling of 228521138 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, one hundred thirty-eight".