228768538 has 4 divisors (see below), whose sum is σ = 343152810. Its totient is φ = 114384268.

The previous prime is 228768509. The next prime is 228768539. The reversal of 228768538 is 835867822.

It is a happy number.

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., 196925089 + 31843449 = 14033^2 + 5643^2 .

It is a junction number, because it is equal to n+sod(n) for n = 228768491 and 228768500.

It is not an unprimeable number, because it can be changed into a prime (228768539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57192133 + ... + 57192136.

Almost surely, 2^228768538 is an apocalyptic number.

228768538 is a deficient number, since it is larger than the sum of its proper divisors (114384272).

228768538 is a wasteful number, since it uses less digits than its factorization.

228768538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114384271.

The product of its digits is 1290240, while the sum is 49.

The square root of 228768538 is about 15125.0962972141. The cubic root of 228768538 is about 611.5971208200.

The spelling of 228768538 in words is "two hundred twenty-eight million, seven hundred sixty-eight thousand, five hundred thirty-eight".