22728921998 has 4 divisors (see below), whose sum is σ = 34093383000. Its totient is φ = 11364460998.

The previous prime is 22728921997. The next prime is 22728922001. The reversal of 22728921998 is 89912982722.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22728921997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5682230498 + ... + 5682230501.

It is an arithmetic number, because the mean of its divisors is an integer number (8523345750).

Almost surely, 2^22728921998 is an apocalyptic number.

22728921998 is a deficient number, since it is larger than the sum of its proper divisors (11364461002).

22728921998 is a wasteful number, since it uses less digits than its factorization.

22728921998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11364461001.

The product of its digits is 5225472, while the sum is 59.

The spelling of 22728921998 in words is "twenty-two billion, seven hundred twenty-eight million, nine hundred twenty-one thousand, nine hundred ninety-eight".