228768139 has 2 divisors, whose sum is σ = 228768140. Its totient is φ = 228768138.

The previous prime is 228768109. The next prime is 228768187. The reversal of 228768139 is 931867822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228768139 - 2⁷ = 228768011 is a prime.

It is a super-2 number, since 2×228768139² = 104669722843046642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (228768109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114384069 + 114384070.

It is an arithmetic number, because the mean of its divisors is an integer number (114384070).

Almost surely, 2^228768139 is an apocalyptic number.

228768139 is a deficient number, since it is larger than the sum of its proper divisors (1).

228768139 is an equidigital number, since it uses as much as digits as its factorization.

228768139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 228768139 is about 15125.0831072097. The cubic root of 228768139 is about 611.5967652534.

The spelling of 228768139 in words is "two hundred twenty-eight million, seven hundred sixty-eight thousand, one hundred thirty-nine".