28022779 has 4 divisors (see below), whose sum is σ = 28033776. Its totient is φ = 28011784.

The previous prime is 28022759. The next prime is 28022789. The reversal of 28022779 is 97722082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28022779 - 2⁵ = 28022747 is a prime.

It is a super-2 number, since 2×28022779² = 1570552285765682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28022759) 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, 522 + ... + 7504.

It is an arithmetic number, because the mean of its divisors is an integer number (7008444).

Almost surely, 2^28022779 is an apocalyptic number.

28022779 is a deficient number, since it is larger than the sum of its proper divisors (10997).

28022779 is an equidigital number, since it uses as much as digits as its factorization.

28022779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10996.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 28022779 is about 5293.6545977236. The cubic root of 28022779 is about 303.7412206532.

The spelling of 28022779 in words is "twenty-eight million, twenty-two thousand, seven hundred seventy-nine".