228768778 has 32 divisors (see below), whose sum is σ = 426147840. Its totient is φ = 89884080.

The previous prime is 228768773. The next prime is 228768781. The reversal of 228768778 is 877867822.

It is a happy number.

It is a super-2 number, since 2×228768778² = 104670307575226568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228768773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5626 + ... + 22117.

It is an arithmetic number, because the mean of its divisors is an integer number (13317120).

Almost surely, 2^228768778 is an apocalyptic number.

228768778 is a deficient number, since it is larger than the sum of its proper divisors (197379062).

228768778 is a wasteful number, since it uses less digits than its factorization.

228768778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27802.

The product of its digits is 4214784, while the sum is 55.

The square root of 228768778 is about 15125.1042310458. The cubic root of 228768778 is about 611.5973346945.

The spelling of 228768778 in words is "two hundred twenty-eight million, seven hundred sixty-eight thousand, seven hundred seventy-eight".