22643145 has 80 divisors (see below), whose sum is σ = 47625600. Its totient is φ = 10287648.

The previous prime is 22643141. The next prime is 22643161. The reversal of 22643145 is 54134622.

22643145 is a `hidden beast` number, since 2 + 2 + 643 + 14 + 5 = 666.

It is not a de Polignac number, because 22643145 - 2² = 22643141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (22643141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 138834 + ... + 138996.

It is an arithmetic number, because the mean of its divisors is an integer number (595320).

Almost surely, 2^22643145 is an apocalyptic number.

It is an amenable number.

22643145 is an abundant number, since it is smaller than the sum of its proper divisors (24982455).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22643145 is an equidigital number, since it uses as much as digits as its factorization.

22643145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 178 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 22643145 is about 4758.4813753970. The cubic root of 22643145 is about 282.9082306385.

Adding to 22643145 its reverse (54134622), we get a palindrome (76777767).

The spelling of 22643145 in words is "twenty-two million, six hundred forty-three thousand, one hundred forty-five".