22128742 has 4 divisors (see below), whose sum is σ = 33193116. Its totient is φ = 11064370.

The previous prime is 22128739. The next prime is 22128767. The reversal of 22128742 is 24782122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 22128742.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5532184 + ... + 5532187.

It is an arithmetic number, because the mean of its divisors is an integer number (8298279).

Almost surely, 2^22128742 is an apocalyptic number.

22128742 is a deficient number, since it is larger than the sum of its proper divisors (11064374).

22128742 is a wasteful number, since it uses less digits than its factorization.

22128742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11064373.

The product of its digits is 3584, while the sum is 28.

The square root of 22128742 is about 4704.1196838516. The cubic root of 22128742 is about 280.7494463283.

The spelling of 22128742 in words is "twenty-two million, one hundred twenty-eight thousand, seven hundred forty-two".