28810839 has 8 divisors (see below), whose sum is σ = 38717440. Its totient is φ = 19055736.

The previous prime is 28810807. The next prime is 28810841. The reversal of 28810839 is 93801882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28810839 - 2⁵ = 28810807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28810797 and 28810806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28810879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37429 + ... + 38190.

It is an arithmetic number, because the mean of its divisors is an integer number (4839680).

Almost surely, 2^28810839 is an apocalyptic number.

28810839 is a deficient number, since it is larger than the sum of its proper divisors (9906601).

28810839 is a wasteful number, since it uses less digits than its factorization.

28810839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75749.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 28810839 is about 5367.5729152011. The cubic root of 28810839 is about 306.5622219674.

The spelling of 28810839 in words is "twenty-eight million, eight hundred ten thousand, eight hundred thirty-nine".