28831879 has 4 divisors (see below), whose sum is σ = 28853176. Its totient is φ = 28810584.

The previous prime is 28831871. The next prime is 28831889. The reversal of 28831879 is 97813882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28831879 - 2³ = 28831871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28831871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8469 + ... + 11374.

It is an arithmetic number, because the mean of its divisors is an integer number (7213294).

Almost surely, 2^28831879 is an apocalyptic number.

28831879 is a deficient number, since it is larger than the sum of its proper divisors (21297).

28831879 is a wasteful number, since it uses less digits than its factorization.

28831879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21296.

The product of its digits is 193536, while the sum is 46.

The square root of 28831879 is about 5369.5324749926. The cubic root of 28831879 is about 306.6368293014.

The spelling of 28831879 in words is "twenty-eight million, eight hundred thirty-one thousand, eight hundred seventy-nine".