198722778 has 16 divisors (see below), whose sum is σ = 397918560. Its totient is φ = 66162096.

The previous prime is 198722701. The next prime is 198722789. The reversal of 198722778 is 877227891.

It is a happy number.

198722778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 198722778.

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, 14125 + ... + 24432.

It is an arithmetic number, because the mean of its divisors is an integer number (24869910).

Almost surely, 2^198722778 is an apocalyptic number.

198722778 is an abundant number, since it is smaller than the sum of its proper divisors (199195782).

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

198722778 is a wasteful number, since it uses less digits than its factorization.

198722778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39421.

The product of its digits is 790272, while the sum is 51.

The square root of 198722778 is about 14096.9066819640. The cubic root of 198722778 is about 583.5560149736.

The spelling of 198722778 in words is "one hundred ninety-eight million, seven hundred twenty-two thousand, seven hundred seventy-eight".