28808123 has 4 divisors (see below), whose sum is σ = 30324360. Its totient is φ = 27291888.

The previous prime is 28808099. The next prime is 28808137. The reversal of 28808123 is 32180882.

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 28808123 - 2¹⁶ = 28742587 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 28808123.

It is not an unprimeable number, because it can be changed into a prime (28808623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758090 + ... + 758127.

It is an arithmetic number, because the mean of its divisors is an integer number (7581090).

Almost surely, 2^28808123 is an apocalyptic number.

28808123 is a deficient number, since it is larger than the sum of its proper divisors (1516237).

28808123 is a wasteful number, since it uses less digits than its factorization.

28808123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516236.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 28808123 is about 5367.3199084832. The cubic root of 28808123 is about 306.5525884499.

The spelling of 28808123 in words is "twenty-eight million, eight hundred eight thousand, one hundred twenty-three".