22209778 has 4 divisors (see below), whose sum is σ = 33314670. Its totient is φ = 11104888.

The previous prime is 22209773. The next prime is 22209797. The reversal of 22209778 is 87790222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13227769 + 8982009 = 3637^2 + 2997^2 .

It is not an unprimeable number, because it can be changed into a prime (22209773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5552443 + ... + 5552446.

Almost surely, 2^22209778 is an apocalyptic number.

22209778 is a deficient number, since it is larger than the sum of its proper divisors (11104892).

22209778 is a wasteful number, since it uses less digits than its factorization.

22209778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11104891.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 22209778 is about 4712.7251139866. The cubic root of 22209778 is about 281.0917326507.

The spelling of 22209778 in words is "twenty-two million, two hundred nine thousand, seven hundred seventy-eight".