22780891 has 16 divisors (see below), whose sum is σ = 26699200. Its totient is φ = 19035648.

The previous prime is 22780889. The next prime is 22780931. The reversal of 22780891 is 19808722.

It is a cyclic number.

It is not a de Polignac number, because 22780891 - 2¹ = 22780889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22780891.

It is not an unprimeable number, because it can be changed into a prime (22780801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55495 + ... + 55903.

It is an arithmetic number, because the mean of its divisors is an integer number (1668700).

Almost surely, 2^22780891 is an apocalyptic number.

22780891 is a deficient number, since it is larger than the sum of its proper divisors (3918309).

22780891 is a wasteful number, since it uses less digits than its factorization.

22780891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 22780891 is about 4772.9331652559. The cubic root of 22780891 is about 283.4807471266.

It can be divided in two parts, 227 and 80891, that added together give a palindrome (81118).

The spelling of 22780891 in words is "twenty-two million, seven hundred eighty thousand, eight hundred ninety-one".