22728723 has 8 divisors (see below), whose sum is σ = 30421248. Its totient is φ = 15094344.

The previous prime is 22728703. The next prime is 22728757. The reversal of 22728723 is 32782722.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22728723 - 2⁵ = 22728691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22728703) 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 7 ways as a sum of consecutive naturals, for example, 13615 + ... + 15192.

It is an arithmetic number, because the mean of its divisors is an integer number (3802656).

Almost surely, 2^22728723 is an apocalyptic number.

22728723 is a deficient number, since it is larger than the sum of its proper divisors (7692525).

22728723 is a wasteful number, since it uses less digits than its factorization.

22728723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29073.

The product of its digits is 18816, while the sum is 33.

The square root of 22728723 is about 4767.4650496884. The cubic root of 22728723 is about 283.2641924333.

The spelling of 22728723 in words is "twenty-two million, seven hundred twenty-eight thousand, seven hundred twenty-three".