28744491 has 4 divisors (see below), whose sum is σ = 38325992. Its totient is φ = 19162992.

The previous prime is 28744487. The next prime is 28744493. The reversal of 28744491 is 19444782.

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

It is not a de Polignac number, because 28744491 - 2² = 28744487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28744493) 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, 4790746 + ... + 4790751.

It is an arithmetic number, because the mean of its divisors is an integer number (9581498).

Almost surely, 2^28744491 is an apocalyptic number.

28744491 is a deficient number, since it is larger than the sum of its proper divisors (9581501).

28744491 is an equidigital number, since it uses as much as digits as its factorization.

28744491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9581500.

The product of its digits is 64512, while the sum is 39.

The square root of 28744491 is about 5361.3889058713. The cubic root of 28744491 is about 306.3267154196.

The spelling of 28744491 in words is "twenty-eight million, seven hundred forty-four thousand, four hundred ninety-one".