222642778 has 16 divisors (see below), whose sum is σ = 353885760. Its totient is φ = 104691136.

The previous prime is 222642767. The next prime is 222642787. The reversal of 222642778 is 877246222.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 222642778.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82275 + ... + 84937.

It is an arithmetic number, because the mean of its divisors is an integer number (22117860).

Almost surely, 2^222642778 is an apocalyptic number.

222642778 is a deficient number, since it is larger than the sum of its proper divisors (131242982).

222642778 is a wasteful number, since it uses less digits than its factorization.

222642778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5141.

The product of its digits is 150528, while the sum is 40.

The square root of 222642778 is about 14921.2190520748. The cubic root of 222642778 is about 606.0887237709.

The spelling of 222642778 in words is "two hundred twenty-two million, six hundred forty-two thousand, seven hundred seventy-eight".