28080491 has 4 divisors (see below), whose sum is σ = 28114800. Its totient is φ = 28046184.

The previous prime is 28080473. The next prime is 28080511. The reversal of 28080491 is 19408082.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28080491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28080421) 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, 15896 + ... + 17573.

It is an arithmetic number, because the mean of its divisors is an integer number (7028700).

Almost surely, 2^28080491 is an apocalyptic number.

28080491 is a deficient number, since it is larger than the sum of its proper divisors (34309).

28080491 is an equidigital number, since it uses as much as digits as its factorization.

28080491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34308.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 28080491 is about 5299.1028485962. The cubic root of 28080491 is about 303.9495927214.

The spelling of 28080491 in words is "twenty-eight million, eighty thousand, four hundred ninety-one".