22718681 has 4 divisors (see below), whose sum is σ = 24055092. Its totient is φ = 21382272.

The previous prime is 22718671. The next prime is 22718693. The reversal of 22718681 is 18681722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18139081 + 4579600 = 4259^2 + 2140^2 .

It is a cyclic number.

It is not a de Polignac number, because 22718681 - 2⁶ = 22718617 is a prime.

It is a super-2 number, since 2×22718681² = 1032276932759522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22718611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668180 + ... + 668213.

It is an arithmetic number, because the mean of its divisors is an integer number (6013773).

Almost surely, 2^22718681 is an apocalyptic number.

It is an amenable number.

22718681 is a deficient number, since it is larger than the sum of its proper divisors (1336411).

22718681 is a wasteful number, since it uses less digits than its factorization.

22718681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336410.

The product of its digits is 10752, while the sum is 35.

The square root of 22718681 is about 4766.4117530906. The cubic root of 22718681 is about 283.2224690443. Note that the first 3 decimals are identical.

The spelling of 22718681 in words is "twenty-two million, seven hundred eighteen thousand, six hundred eighty-one".