28728806 has 4 divisors (see below), whose sum is σ = 43093212. Its totient is φ = 14364402.

The previous prime is 28728787. The next prime is 28728851. The reversal of 28728806 is 60882782.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7182200 + ... + 7182203.

It is an arithmetic number, because the mean of its divisors is an integer number (10773303).

Almost surely, 2^28728806 is an apocalyptic number.

28728806 is a deficient number, since it is larger than the sum of its proper divisors (14364406).

28728806 is a wasteful number, since it uses less digits than its factorization.

28728806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14364405.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 28728806 is about 5359.9259323241. The cubic root of 28728806 is about 306.2709875385.

The spelling of 28728806 in words is "twenty-eight million, seven hundred twenty-eight thousand, eight hundred six".