28500811 has 4 divisors (see below), whose sum is σ = 29420224. Its totient is φ = 27581400.

The previous prime is 28500763. The next prime is 28500827. The reversal of 28500811 is 11800582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11800582 = 2 ⋅5900291.

It is a cyclic number.

It is not a de Polignac number, because 28500811 - 2⁷ = 28500683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28500851) 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, 459660 + ... + 459721.

It is an arithmetic number, because the mean of its divisors is an integer number (7355056).

Almost surely, 2^28500811 is an apocalyptic number.

28500811 is a deficient number, since it is larger than the sum of its proper divisors (919413).

28500811 is an equidigital number, since it uses as much as digits as its factorization.

28500811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919412.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 28500811 is about 5338.6150825846. The cubic root of 28500811 is about 305.4586345508.

The spelling of 28500811 in words is "twenty-eight million, five hundred thousand, eight hundred eleven".