28403879 has 12 divisors (see below), whose sum is σ = 34781400. Its totient is φ = 23064048.

The previous prime is 28403863. The next prime is 28403929. The reversal of 28403879 is 97830482.

It is not a de Polignac number, because 28403879 - 2⁴ = 28403863 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28403849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14324 + ... + 16185.

It is an arithmetic number, because the mean of its divisors is an integer number (2898450).

Almost surely, 2^28403879 is an apocalyptic number.

28403879 is a deficient number, since it is larger than the sum of its proper divisors (6377521).

28403879 is a wasteful number, since it uses less digits than its factorization.

28403879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30542 (or 30535 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28403879 is about 5329.5289660532. The cubic root of 28403879 is about 305.1119503038. Note that the first 3 decimals are identical.

The spelling of 28403879 in words is "twenty-eight million, four hundred three thousand, eight hundred seventy-nine".