22688881 has 4 divisors (see below), whose sum is σ = 23302132. Its totient is φ = 22075632.

The previous prime is 22688873. The next prime is 22688899. The reversal of 22688881 is 18888622.

It is a happy number.

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 14938225 + 7750656 = 3865^2 + 2784^2 .

It is a cyclic number.

It is not a de Polignac number, because 22688881 - 2³ = 22688873 is a prime.

It is a super-2 number, since 2×22688881² = 1029570642064322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22688801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306570 + ... + 306643.

It is an arithmetic number, because the mean of its divisors is an integer number (5825533).

Almost surely, 2^22688881 is an apocalyptic number.

It is an amenable number.

22688881 is a deficient number, since it is larger than the sum of its proper divisors (613251).

22688881 is an equidigital number, since it uses as much as digits as its factorization.

22688881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613250.

The product of its digits is 98304, while the sum is 43.

The square root of 22688881 is about 4763.2846860124. The cubic root of 22688881 is about 283.0985809466.

The spelling of 22688881 in words is "twenty-two million, six hundred eighty-eight thousand, eight hundred eighty-one".