28507873 has 4 divisors (see below), whose sum is σ = 28523268. Its totient is φ = 28492480.

The previous prime is 28507867. The next prime is 28507889. The reversal of 28507873 is 37870582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37870582 = 2 ⋅18935291.

It can be written as a sum of positive squares in 2 ways, for example, as 17164449 + 11343424 = 4143^2 + 3368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28507873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28507273) 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, 4468 + ... + 8773.

It is an arithmetic number, because the mean of its divisors is an integer number (7130817).

Almost surely, 2^28507873 is an apocalyptic number.

It is an amenable number.

28507873 is a deficient number, since it is larger than the sum of its proper divisors (15395).

28507873 is a wasteful number, since it uses less digits than its factorization.

28507873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15394.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 28507873 is about 5339.2764491081. The cubic root of 28507873 is about 305.4838615608.

The spelling of 28507873 in words is "twenty-eight million, five hundred seven thousand, eight hundred seventy-three".