22728718 has 4 divisors (see below), whose sum is σ = 34093080. Its totient is φ = 11364358.

The previous prime is 22728703. The next prime is 22728757. The reversal of 22728718 is 81782722.

It is a happy number.

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

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, 5682178 + ... + 5682181.

It is an arithmetic number, because the mean of its divisors is an integer number (8523270).

Almost surely, 2^22728718 is an apocalyptic number.

22728718 is a deficient number, since it is larger than the sum of its proper divisors (11364362).

22728718 is a wasteful number, since it uses less digits than its factorization.

22728718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11364361.

The product of its digits is 25088, while the sum is 37.

The square root of 22728718 is about 4767.4645253006. The cubic root of 22728718 is about 283.2641716619.

The spelling of 22728718 in words is "twenty-two million, seven hundred twenty-eight thousand, seven hundred eighteen".