28969879 has 8 divisors (see below), whose sum is σ = 29270720. Its totient is φ = 28670976.

The previous prime is 28969877. The next prime is 28969891. The reversal of 28969879 is 97896982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28969879 - 2¹ = 28969877 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 (28969873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70627 + ... + 71035.

It is an arithmetic number, because the mean of its divisors is an integer number (3658840).

Almost surely, 2^28969879 is an apocalyptic number.

28969879 is a deficient number, since it is larger than the sum of its proper divisors (300841).

28969879 is a wasteful number, since it uses less digits than its factorization.

28969879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969.

The product of its digits is 3919104, while the sum is 58.

The square root of 28969879 is about 5382.3674159240. The cubic root of 28969879 is about 307.1252764616.

The spelling of 28969879 in words is "twenty-eight million, nine hundred sixty-nine thousand, eight hundred seventy-nine".