28879289 has 4 divisors (see below), whose sum is σ = 28922256. Its totient is φ = 28836324.

The previous prime is 28879267. The next prime is 28879303. The reversal of 28879289 is 98297882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28879289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28879289.

It is not an unprimeable number, because it can be changed into a prime (28879229) 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, 20459 + ... + 21824.

It is an arithmetic number, because the mean of its divisors is an integer number (7230564).

Almost surely, 2^28879289 is an apocalyptic number.

It is an amenable number.

28879289 is a deficient number, since it is larger than the sum of its proper divisors (42967).

28879289 is an equidigital number, since it uses as much as digits as its factorization.

28879289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42966.

The product of its digits is 1161216, while the sum is 53.

The square root of 28879289 is about 5373.9453849104. The cubic root of 28879289 is about 306.8048110803.

The spelling of 28879289 in words is "twenty-eight million, eight hundred seventy-nine thousand, two hundred eighty-nine".