28728122 has 4 divisors (see below), whose sum is σ = 43092186. Its totient is φ = 14364060.

The previous prime is 28728121. The next prime is 28728151. The reversal of 28728122 is 22182782.

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., 21335161 + 7392961 = 4619^2 + 2719^2 .

It is not an unprimeable number, because it can be changed into a prime (28728121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7182029 + ... + 7182032.

Almost surely, 2^28728122 is an apocalyptic number.

28728122 is a deficient number, since it is larger than the sum of its proper divisors (14364064).

28728122 is a wasteful number, since it uses less digits than its factorization.

28728122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14364063.

The product of its digits is 7168, while the sum is 32.

The square root of 28728122 is about 5359.8621250924. The cubic root of 28728122 is about 306.2685568653.

The spelling of 28728122 in words is "twenty-eight million, seven hundred twenty-eight thousand, one hundred twenty-two".