28907879 has 16 divisors (see below), whose sum is σ = 38814720. Its totient is φ = 20792160.

The previous prime is 28907861. The next prime is 28907891. The reversal of 28907879 is 97870982.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28907879 - 2⁸ = 28907623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28907819) 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, 13439 + ... + 15440.

It is an arithmetic number, because the mean of its divisors is an integer number (2425920).

Almost surely, 2^28907879 is an apocalyptic number.

28907879 is a deficient number, since it is larger than the sum of its proper divisors (9906841).

28907879 is a wasteful number, since it uses less digits than its factorization.

28907879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28910.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 28907879 is about 5376.6047836902. The cubic root of 28907879 is about 306.9060215196.

The spelling of 28907879 in words is "twenty-eight million, nine hundred seven thousand, eight hundred seventy-nine".