22728999 has 4 divisors (see below), whose sum is σ = 30305336. Its totient is φ = 15152664.

The previous prime is 22728977. The next prime is 22729019. The reversal of 22728999 is 99982722.

It is a happy number.

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

It is not a de Polignac number, because 22728999 - 2⁵ = 22728967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22728929) 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 in 3 ways as a sum of consecutive naturals, for example, 3788164 + ... + 3788169.

It is an arithmetic number, because the mean of its divisors is an integer number (7576334).

Almost surely, 2^22728999 is an apocalyptic number.

22728999 is a deficient number, since it is larger than the sum of its proper divisors (7576337).

22728999 is an equidigital number, since it uses as much as digits as its factorization.

22728999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7576336.

The product of its digits is 326592, while the sum is 48.

The square root of 22728999 is about 4767.4939958011. The cubic root of 22728999 is about 283.2653390089.

The spelling of 22728999 in words is "twenty-two million, seven hundred twenty-eight thousand, nine hundred ninety-nine".