28344433 has 4 divisors (see below), whose sum is σ = 30524788. Its totient is φ = 26164080.

The previous prime is 28344403. The next prime is 28344451. The reversal of 28344433 is 33444382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33444382 = 2 ⋅16722191.

It can be written as a sum of positive squares in 2 ways, for example, as 14379264 + 13965169 = 3792^2 + 3737^2 .

It is a cyclic number.

It is not a de Polignac number, because 28344433 - 2⁵ = 28344401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28344395 and 28344404.

It is not an unprimeable number, because it can be changed into a prime (28344403) 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, 1090158 + ... + 1090183.

It is an arithmetic number, because the mean of its divisors is an integer number (7631197).

Almost surely, 2^28344433 is an apocalyptic number.

It is an amenable number.

28344433 is a deficient number, since it is larger than the sum of its proper divisors (2180355).

28344433 is a wasteful number, since it uses less digits than its factorization.

28344433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180354.

The product of its digits is 27648, while the sum is 31.

The square root of 28344433 is about 5323.9490042637. The cubic root of 28344433 is about 304.8989470835.

The spelling of 28344433 in words is "twenty-eight million, three hundred forty-four thousand, four hundred thirty-three".