22643738 has 16 divisors (see below), whose sum is σ = 36657096. Its totient is φ = 10428480.

The previous prime is 22643737. The next prime is 22643759. The reversal of 22643738 is 83734622.

It can be written as a sum of positive squares in 4 ways, for example, as 10582009 + 12061729 = 3253^2 + 3473^2 .

It is a super-2 number, since 2×22643738² = 1025477741225288, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 22643698 and 22643707.

It is not an unprimeable number, because it can be changed into a prime (22643737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21668 + ... + 22688.

Almost surely, 2^22643738 is an apocalyptic number.

22643738 is a deficient number, since it is larger than the sum of its proper divisors (14013358).

22643738 is a wasteful number, since it uses less digits than its factorization.

22643738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889.

The product of its digits is 48384, while the sum is 35.

The square root of 22643738 is about 4758.5436847842. The cubic root of 22643738 is about 282.9107003060.

The spelling of 22643738 in words is "twenty-two million, six hundred forty-three thousand, seven hundred thirty-eight".