22638505 has 4 divisors (see below), whose sum is σ = 27166212. Its totient is φ = 18110800.

The previous prime is 22638491. The next prime is 22638523. The reversal of 22638505 is 50583622.

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 5631129 + 17007376 = 2373^2 + 4124^2 .

It is not a de Polignac number, because 22638505 - 2⁷ = 22638377 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2263846 + ... + 2263855.

It is an arithmetic number, because the mean of its divisors is an integer number (6791553).

Almost surely, 2^22638505 is an apocalyptic number.

It is an amenable number.

22638505 is a deficient number, since it is larger than the sum of its proper divisors (4527707).

22638505 is an equidigital number, since it uses as much as digits as its factorization.

22638505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527706.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 22638505 is about 4757.9937999119. The cubic root of 22638505 is about 282.8889049387. Note that the first 3 decimals are identical.

The spelling of 22638505 in words is "twenty-two million, six hundred thirty-eight thousand, five hundred five".