28282039 has 4 divisors (see below), whose sum is σ = 28292760. Its totient is φ = 28271320.

The previous prime is 28282021. The next prime is 28282043. The reversal of 28282039 is 93028282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93028282 = 2 ⋅46514141.

It is a cyclic number.

It is not a de Polignac number, because 28282039 - 2²¹ = 26184887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28281995 and 28282013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28282099) 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, 1677 + ... + 7705.

It is an arithmetic number, because the mean of its divisors is an integer number (7073190).

Almost surely, 2^28282039 is an apocalyptic number.

28282039 is a deficient number, since it is larger than the sum of its proper divisors (10721).

28282039 is an equidigital number, since it uses as much as digits as its factorization.

28282039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10720.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28282039 is about 5318.0860278863. The cubic root of 28282039 is about 304.6750601925.

The spelling of 28282039 in words is "twenty-eight million, two hundred eighty-two thousand, thirty-nine".