989190221828 has 6 divisors (see below), whose sum is σ = 1731082888206. Its totient is φ = 494595110912.

The previous prime is 989190221779. The next prime is 989190221839. The reversal of 989190221828 is 828122091989.

It can be written as a sum of positive squares in only one way, i.e., 967472894404 + 21717327424 = 983602^2 + 147368^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123648777725 + ... + 123648777732.

It is an arithmetic number, because the mean of its divisors is an integer number (288513814701).

Almost surely, 2^989190221828 is an apocalyptic number.

It is an amenable number.

989190221828 is a deficient number, since it is larger than the sum of its proper divisors (741892666378).

989190221828 is a wasteful number, since it uses less digits than its factorization.

989190221828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247297555461 (or 247297555459 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 59.

The spelling of 989190221828 in words is "nine hundred eighty-nine billion, one hundred ninety million, two hundred twenty-one thousand, eight hundred twenty-eight".