28033491 has 4 divisors (see below), whose sum is σ = 37377992. Its totient is φ = 18688992.

The previous prime is 28033469. The next prime is 28033513. The reversal of 28033491 is 19433082.

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

It is an interprime number because it is at equal distance from previous prime (28033469) and next prime (28033513).

It is not a de Polignac number, because 28033491 - 2¹⁹ = 27509203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28033441) 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, 4672246 + ... + 4672251.

It is an arithmetic number, because the mean of its divisors is an integer number (9344498).

Almost surely, 2^28033491 is an apocalyptic number.

28033491 is a deficient number, since it is larger than the sum of its proper divisors (9344501).

28033491 is an equidigital number, since it uses as much as digits as its factorization.

28033491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9344500.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28033491 is about 5294.6662784353. Note that the first 3 decimals coincide. The cubic root of 28033491 is about 303.7799184742.

The spelling of 28033491 in words is "twenty-eight million, thirty-three thousand, four hundred ninety-one".