28928873 has 4 divisors (see below), whose sum is σ = 28947600. Its totient is φ = 28910148.

The previous prime is 28928843. The next prime is 28928891. The reversal of 28928873 is 37882982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28928873 - 2⁸ = 28928617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28928803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6815 + ... + 10212.

It is an arithmetic number, because the mean of its divisors is an integer number (7236900).

Almost surely, 2^28928873 is an apocalyptic number.

It is an amenable number.

28928873 is a deficient number, since it is larger than the sum of its proper divisors (18727).

28928873 is a wasteful number, since it uses less digits than its factorization.

28928873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18726.

The product of its digits is 387072, while the sum is 47.

The square root of 28928873 is about 5378.5567766828. The cubic root of 28928873 is about 306.9802991457.

The spelling of 28928873 in words is "twenty-eight million, nine hundred twenty-eight thousand, eight hundred seventy-three".