28122899 has 4 divisors (see below), whose sum is σ = 32140464. Its totient is φ = 24105336.

The previous prime is 28122893. The next prime is 28122901. The reversal of 28122899 is 99822182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99822182 = 2 ⋅49911091.

It is a cyclic number.

It is not a de Polignac number, because 28122899 - 2⁴ = 28122883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28122893) 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, 2008772 + ... + 2008785.

It is an arithmetic number, because the mean of its divisors is an integer number (8035116).

Almost surely, 2^28122899 is an apocalyptic number.

28122899 is a deficient number, since it is larger than the sum of its proper divisors (4017565).

28122899 is an equidigital number, since it uses as much as digits as its factorization.

28122899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017564.

The product of its digits is 41472, while the sum is 41.

The square root of 28122899 is about 5303.1027710200. The cubic root of 28122899 is about 304.1025270233.

The spelling of 28122899 in words is "twenty-eight million, one hundred twenty-two thousand, eight hundred ninety-nine".