28973885 has 4 divisors (see below), whose sum is σ = 34768668. Its totient is φ = 23179104.

The previous prime is 28973869. The next prime is 28973927. The reversal of 28973885 is 58837982.

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 13942756 + 15031129 = 3734^2 + 3877^2 .

It is a cyclic number.

It is not a de Polignac number, because 28973885 - 2⁴ = 28973869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2897384 + ... + 2897393.

It is an arithmetic number, because the mean of its divisors is an integer number (8692167).

Almost surely, 2^28973885 is an apocalyptic number.

It is an amenable number.

28973885 is a deficient number, since it is larger than the sum of its proper divisors (5794783).

28973885 is an equidigital number, since it uses as much as digits as its factorization.

28973885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5794782.

The product of its digits is 967680, while the sum is 50.

The square root of 28973885 is about 5382.7395441355. The cubic root of 28973885 is about 307.1394323963.

The spelling of 28973885 in words is "twenty-eight million, nine hundred seventy-three thousand, eight hundred eighty-five".