28685873 has 4 divisors (see below), whose sum is σ = 28746240. Its totient is φ = 28625508.

The previous prime is 28685863. The next prime is 28685893. The reversal of 28685873 is 37858682.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37858682 = 2 ⋅18929341.

It is a cyclic number.

It is not a de Polignac number, because 28685873 - 2¹⁰ = 28684849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28685803) 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, 29465 + ... + 30422.

It is an arithmetic number, because the mean of its divisors is an integer number (7186560).

Almost surely, 2^28685873 is an apocalyptic number.

It is an amenable number.

28685873 is a deficient number, since it is larger than the sum of its proper divisors (60367).

28685873 is an equidigital number, since it uses as much as digits as its factorization.

28685873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60366.

The product of its digits is 645120, while the sum is 47.

The square root of 28685873 is about 5355.9194355405. The cubic root of 28685873 is about 306.1183452988.

The spelling of 28685873 in words is "twenty-eight million, six hundred eighty-five thousand, eight hundred seventy-three".