28103939 has 8 divisors (see below), whose sum is σ = 28715040. Its totient is φ = 27495936.

The previous prime is 28103909. The next prime is 28103947. The reversal of 28103939 is 93930182.

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

It is a cyclic number.

It is not a de Polignac number, because 28103939 - 2²⁰ = 27055363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28103899 and 28103908.

It is not an unprimeable number, because it can be changed into a prime (28103909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30122 + ... + 31040.

It is an arithmetic number, because the mean of its divisors is an integer number (3589380).

Almost surely, 2^28103939 is an apocalyptic number.

28103939 is a deficient number, since it is larger than the sum of its proper divisors (611101).

28103939 is an equidigital number, since it uses as much as digits as its factorization.

28103939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 28103939 is about 5301.3148369060. The cubic root of 28103939 is about 304.0341713377.

The spelling of 28103939 in words is "twenty-eight million, one hundred three thousand, nine hundred thirty-nine".