22890145 has 4 divisors (see below), whose sum is σ = 27468180. Its totient is φ = 18312112.

The previous prime is 22890113. The next prime is 22890151. The reversal of 22890145 is 54109822.

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 10556001 + 12334144 = 3249^2 + 3512^2 .

It is a cyclic number.

It is not a de Polignac number, because 22890145 - 2⁵ = 22890113 is a prime.

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, 2289010 + ... + 2289019.

It is an arithmetic number, because the mean of its divisors is an integer number (6867045).

Almost surely, 2^22890145 is an apocalyptic number.

It is an amenable number.

22890145 is a deficient number, since it is larger than the sum of its proper divisors (4578035).

22890145 is an equidigital number, since it uses as much as digits as its factorization.

22890145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578034.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 22890145 is about 4784.3646391135. The cubic root of 22890145 is about 283.9332027325.

Adding to 22890145 its reverse (54109822), we get a palindrome (76999967).

The spelling of 22890145 in words is "twenty-two million, eight hundred ninety thousand, one hundred forty-five".