22278813 has 16 divisors (see below), whose sum is σ = 30412800. Its totient is φ = 14502320.

The previous prime is 22278793. The next prime is 22278827. The reversal of 22278813 is 31887222.

It is a cyclic number.

It is not a de Polignac number, because 22278813 - 2⁶ = 22278749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22270813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33478 + ... + 34136.

It is an arithmetic number, because the mean of its divisors is an integer number (1900800).

Almost surely, 2^22278813 is an apocalyptic number.

It is an amenable number.

22278813 is a deficient number, since it is larger than the sum of its proper divisors (8133987).

22278813 is a wasteful number, since it uses less digits than its factorization.

22278813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912.

The product of its digits is 10752, while the sum is 33.

The square root of 22278813 is about 4720.0437497972. The cubic root of 22278813 is about 281.3826720230.

The spelling of 22278813 in words is "twenty-two million, two hundred seventy-eight thousand, eight hundred thirteen".