28728873 has 12 divisors (see below), whose sum is σ = 41998320. Its totient is φ = 18921336.

The previous prime is 28728857. The next prime is 28728881. The reversal of 28728873 is 37882782.

It is not a de Polignac number, because 28728873 - 2⁴ = 28728857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28728373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18483 + ... + 19976.

It is an arithmetic number, because the mean of its divisors is an integer number (3499860).

Almost surely, 2^28728873 is an apocalyptic number.

It is an amenable number.

28728873 is a deficient number, since it is larger than the sum of its proper divisors (13269447).

28728873 is a wasteful number, since it uses less digits than its factorization.

28728873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38548 (or 38545 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 28728873 is about 5359.9321824068. The cubic root of 28728873 is about 306.2712256287.

The spelling of 28728873 in words is "twenty-eight million, seven hundred twenty-eight thousand, eight hundred seventy-three".