22778889 has 16 divisors (see below), whose sum is σ = 34787328. Its totient is φ = 12987792.

The previous prime is 22778869. The next prime is 22778911. The reversal of 22778889 is 98887722.

It is a happy number.

It is not a de Polignac number, because 22778889 - 2⁵ = 22778857 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (22778849) 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 15 ways as a sum of consecutive naturals, for example, 11854 + ... + 13640.

It is an arithmetic number, because the mean of its divisors is an integer number (2174208).

Almost surely, 2^22778889 is an apocalyptic number.

It is an amenable number.

22778889 is a deficient number, since it is larger than the sum of its proper divisors (12008439).

22778889 is a wasteful number, since it uses less digits than its factorization.

22778889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404.

The product of its digits is 903168, while the sum is 51.

The square root of 22778889 is about 4772.7234363621. The cubic root of 22778889 is about 283.4724427239.

The spelling of 22778889 in words is "twenty-two million, seven hundred seventy-eight thousand, eight hundred eighty-nine".