28845791 has 4 divisors (see below), whose sum is σ = 31064712. Its totient is φ = 26626872.

The previous prime is 28845769. The next prime is 28845793. The reversal of 28845791 is 19754882.

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

It is a cyclic number.

It is not a de Polignac number, because 28845791 - 2¹⁴ = 28829407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28845793) 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, 1109441 + ... + 1109466.

It is an arithmetic number, because the mean of its divisors is an integer number (7766178).

Almost surely, 2^28845791 is an apocalyptic number.

28845791 is a deficient number, since it is larger than the sum of its proper divisors (2218921).

28845791 is a wasteful number, since it uses less digits than its factorization.

28845791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218920.

The product of its digits is 161280, while the sum is 44.

The square root of 28845791 is about 5370.8277760509. The cubic root of 28845791 is about 306.6861409866.

Subtracting from 28845791 its reverse (19754882), we obtain a palindrome (9090909).

The spelling of 28845791 in words is "twenty-eight million, eight hundred forty-five thousand, seven hundred ninety-one".