28383939 has 20 divisors (see below), whose sum is σ = 42722680. Its totient is φ = 18779040.

The previous prime is 28383919. The next prime is 28383973. The reversal of 28383939 is 93938382.

It is not a de Polignac number, because 28383939 - 2⁵ = 28383907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28383894 and 28383903.

It is not an unprimeable number, because it can be changed into a prime (28383919) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9999 + ... + 12519.

It is an arithmetic number, because the mean of its divisors is an integer number (2136134).

Almost surely, 2^28383939 is an apocalyptic number.

28383939 is a deficient number, since it is larger than the sum of its proper divisors (14338741).

28383939 is a wasteful number, since it uses less digits than its factorization.

28383939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672 (or 2663 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 28383939 is about 5327.6579282082. The cubic root of 28383939 is about 305.0405356856.

The spelling of 28383939 in words is "twenty-eight million, three hundred eighty-three thousand, nine hundred thirty-nine".