28033839 has 6 divisors (see below), whose sum is σ = 40493336. Its totient is φ = 18689220.

The previous prime is 28033813. The next prime is 28033877. The reversal of 28033839 is 93833082.

It is not a de Polignac number, because 28033839 - 2¹⁷ = 27902767 is a prime.

It is a super-2 number, since 2×28033839² = 1571792258155842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28033879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1557427 + ... + 1557444.

Almost surely, 2^28033839 is an apocalyptic number.

28033839 is a deficient number, since it is larger than the sum of its proper divisors (12459497).

28033839 is a wasteful number, since it uses less digits than its factorization.

28033839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3114877 (or 3114874 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 28033839 is about 5294.6991415944. The cubic root of 28033839 is about 303.7811754823.

The spelling of 28033839 in words is "twenty-eight million, thirty-three thousand, eight hundred thirty-nine".