28517879 has 16 divisors (see below), whose sum is σ = 32524800. Its totient is φ = 24787296.

The previous prime is 28517851. The next prime is 28517893. The reversal of 28517879 is 97871582.

It is a cyclic number.

It is not a de Polignac number, because 28517879 - 2⁸ = 28517623 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 (28517809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64742 + ... + 65180.

It is an arithmetic number, because the mean of its divisors is an integer number (2032800).

Almost surely, 2^28517879 is an apocalyptic number.

28517879 is a deficient number, since it is larger than the sum of its proper divisors (4006921).

28517879 is a wasteful number, since it uses less digits than its factorization.

28517879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734.

The product of its digits is 282240, while the sum is 47.

The square root of 28517879 is about 5340.2133852497. The cubic root of 28517879 is about 305.5195980509.

The spelling of 28517879 in words is "twenty-eight million, five hundred seventeen thousand, eight hundred seventy-nine".