28791443 has 4 divisors (see below), whose sum is σ = 29088360. Its totient is φ = 28494528.

The previous prime is 28791431. The next prime is 28791449. The reversal of 28791443 is 34419782.

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 28791443 - 2⁶ = 28791379 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28791397 and 28791406.

It is not an unprimeable number, because it can be changed into a prime (28791449) 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, 148313 + ... + 148506.

It is an arithmetic number, because the mean of its divisors is an integer number (7272090).

Almost surely, 2^28791443 is an apocalyptic number.

28791443 is a deficient number, since it is larger than the sum of its proper divisors (296917).

28791443 is an equidigital number, since it uses as much as digits as its factorization.

28791443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296916.

The product of its digits is 48384, while the sum is 38.

The square root of 28791443 is about 5365.7658353678. The cubic root of 28791443 is about 306.4934120345.

The spelling of 28791443 in words is "twenty-eight million, seven hundred ninety-one thousand, four hundred forty-three".