28103439 has 32 divisors (see below), whose sum is σ = 46577664. Its totient is φ = 14676480.

The previous prime is 28103423. The next prime is 28103483. The reversal of 28103439 is 93430182.

It is not a de Polignac number, because 28103439 - 2⁴ = 28103423 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28103419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30394 + ... + 31304.

It is an arithmetic number, because the mean of its divisors is an integer number (1455552).

Almost surely, 2^28103439 is an apocalyptic number.

28103439 is a deficient number, since it is larger than the sum of its proper divisors (18474225).

28103439 is a wasteful number, since it uses less digits than its factorization.

28103439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28103439 is about 5301.2676785841. The cubic root of 28103439 is about 304.0323682929.

The spelling of 28103439 in words is "twenty-eight million, one hundred three thousand, four hundred thirty-nine".