28708873 has 4 divisors (see below), whose sum is σ = 28901700. Its totient is φ = 28516048.

The previous prime is 28708861. The next prime is 28708891. The reversal of 28708873 is 37880782.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5745609 + 22963264 = 2397^2 + 4792^2 .

It is a cyclic number.

It is not a de Polignac number, because 28708873 - 2²¹ = 26611721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28708843) 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, 96190 + ... + 96487.

It is an arithmetic number, because the mean of its divisors is an integer number (7225425).

Almost surely, 2^28708873 is an apocalyptic number.

It is an amenable number.

28708873 is a deficient number, since it is larger than the sum of its proper divisors (192827).

28708873 is a wasteful number, since it uses less digits than its factorization.

28708873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192826.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 28708873 is about 5358.0661623388. The cubic root of 28708873 is about 306.2001374880.

The spelling of 28708873 in words is "twenty-eight million, seven hundred eight thousand, eight hundred seventy-three".