1228775118 has 16 divisors (see below), whose sum is σ = 2485164240. Its totient is φ = 404989376.

The previous prime is 1228775111. The next prime is 1228775159. The reversal of 1228775118 is 8115778221.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228775118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228775111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1150005 + ... + 1151072.

It is an arithmetic number, because the mean of its divisors is an integer number (155322765).

Almost surely, 2^1228775118 is an apocalyptic number.

1228775118 is an abundant number, since it is smaller than the sum of its proper divisors (1256389122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1228775118 is a wasteful number, since it uses less digits than its factorization.

1228775118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301171.

The product of its digits is 62720, while the sum is 42.

The square root of 1228775118 is about 35053.8887714330. Note that the first 3 decimals coincide. The cubic root of 1228775118 is about 1071.0854905555.

The spelling of 1228775118 in words is "one billion, two hundred twenty-eight million, seven hundred seventy-five thousand, one hundred eighteen".