28122179 has 4 divisors (see below), whose sum is σ = 28196760. Its totient is φ = 28047600.

The previous prime is 28122161. The next prime is 28122191. The reversal of 28122179 is 97122182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28122179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28122119) 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, 36722 + ... + 37479.

It is an arithmetic number, because the mean of its divisors is an integer number (7049190).

Almost surely, 2^28122179 is an apocalyptic number.

28122179 is a deficient number, since it is larger than the sum of its proper divisors (74581).

28122179 is an equidigital number, since it uses as much as digits as its factorization.

28122179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74580.

The product of its digits is 4032, while the sum is 32.

The square root of 28122179 is about 5303.0348857989. The cubic root of 28122179 is about 304.0999317991.

The spelling of 28122179 in words is "twenty-eight million, one hundred twenty-two thousand, one hundred seventy-nine".