28728475 has 24 divisors (see below), whose sum is σ = 38727680. Its totient is φ = 21060000.

The previous prime is 28728463. The next prime is 28728481. The reversal of 28728475 is 57482782.

It is not a de Polignac number, because 28728475 - 2⁵ = 28728443 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13750 + ... + 15700.

Almost surely, 2^28728475 is an apocalyptic number.

28728475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28728475 is a deficient number, since it is larger than the sum of its proper divisors (9999205).

28728475 is a wasteful number, since it uses less digits than its factorization.

28728475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011 (or 2006 counting only the distinct ones).

The product of its digits is 250880, while the sum is 43.

The square root of 28728475 is about 5359.8950549428. The cubic root of 28728475 is about 306.2698112965.

The spelling of 28728475 in words is "twenty-eight million, seven hundred twenty-eight thousand, four hundred seventy-five".