28825891 has 4 divisors (see below), whose sum is σ = 28938312. Its totient is φ = 28713472.

The previous prime is 28825883. The next prime is 28825903. The reversal of 28825891 is 19852882.

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 28825891 - 2³ = 28825883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28825801) 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, 55825 + ... + 56338.

It is an arithmetic number, because the mean of its divisors is an integer number (7234578).

Almost surely, 2^28825891 is an apocalyptic number.

28825891 is a deficient number, since it is larger than the sum of its proper divisors (112421).

28825891 is a wasteful number, since it uses less digits than its factorization.

28825891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112420.

The product of its digits is 92160, while the sum is 43.

The square root of 28825891 is about 5368.9748555939. The cubic root of 28825891 is about 306.6155996935.

The spelling of 28825891 in words is "twenty-eight million, eight hundred twenty-five thousand, eight hundred ninety-one".