222390778 has 4 divisors (see below), whose sum is σ = 333586170. Its totient is φ = 111195388.

The previous prime is 222390743. The next prime is 222390799. The reversal of 222390778 is 877093222.

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., 219247249 + 3143529 = 14807^2 + 1773^2 .

It is a Smith number, since the sum of its digits (40) 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 222390778.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55597693 + ... + 55597696.

Almost surely, 2^222390778 is an apocalyptic number.

222390778 is a deficient number, since it is larger than the sum of its proper divisors (111195392).

222390778 is a wasteful number, since it uses less digits than its factorization.

222390778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111195391.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 222390778 is about 14912.7723110091. The cubic root of 222390778 is about 605.8599686614.

The spelling of 222390778 in words is "two hundred twenty-two million, three hundred ninety thousand, seven hundred seventy-eight".