28220011 has 8 divisors (see below), whose sum is σ = 30243744. Its totient is φ = 26262720.

The previous prime is 28219999. The next prime is 28220021. The reversal of 28220011 is 11002282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28220011 - 2²³ = 19831403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28220021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15730 + ... + 17431.

It is an arithmetic number, because the mean of its divisors is an integer number (3780468).

Almost surely, 2^28220011 is an apocalyptic number.

28220011 is a deficient number, since it is larger than the sum of its proper divisors (2023733).

28220011 is a wasteful number, since it uses less digits than its factorization.

28220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33221.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 28220011 is about 5312.2510294601. The cubic root of 28220011 is about 304.4521599809.

Adding to 28220011 its reverse (11002282), we get a palindrome (39222293).

The spelling of 28220011 in words is "twenty-eight million, two hundred twenty thousand, eleven".