22556779 has 4 divisors (see below), whose sum is σ = 25779184. Its totient is φ = 19334376.

The previous prime is 22556761. The next prime is 22556789. The reversal of 22556779 is 97765522.

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 22556779 - 2⁹ = 22556267 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (22556749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1611192 + ... + 1611205.

It is an arithmetic number, because the mean of its divisors is an integer number (6444796).

Almost surely, 2^22556779 is an apocalyptic number.

22556779 is a deficient number, since it is larger than the sum of its proper divisors (3222405).

22556779 is an equidigital number, since it uses as much as digits as its factorization.

22556779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222404.

The product of its digits is 264600, while the sum is 43.

The square root of 22556779 is about 4749.3977512944. The cubic root of 22556779 is about 282.5480806774.

The spelling of 22556779 in words is "twenty-two million, five hundred fifty-six thousand, seven hundred seventy-nine".