228118778 has 4 divisors (see below), whose sum is σ = 342178170. Its totient is φ = 114059388.

The previous prime is 228118771. The next prime is 228118783. The reversal of 228118778 is 877811822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877811822 = 2 ⋅438905911.

It can be written as a sum of positive squares in only one way, i.e., 176810209 + 51308569 = 13297^2 + 7163^2 .

It is not an unprimeable number, because it can be changed into a prime (228118771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57029693 + ... + 57029696.

Almost surely, 2^228118778 is an apocalyptic number.

228118778 is a deficient number, since it is larger than the sum of its proper divisors (114059392).

228118778 is a wasteful number, since it uses less digits than its factorization.

228118778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114059391.

The product of its digits is 100352, while the sum is 44.

The square root of 228118778 is about 15103.6014910352. The cubic root of 228118778 is about 611.0175420402.

The spelling of 228118778 in words is "two hundred twenty-eight million, one hundred eighteen thousand, seven hundred seventy-eight".