28893723 has 8 divisors (see below), whose sum is σ = 38595648. Its totient is φ = 19227144.

The previous prime is 28893719. The next prime is 28893743. The reversal of 28893723 is 32739882.

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

It is not a de Polignac number, because 28893723 - 2² = 28893719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28893703) 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 7 ways as a sum of consecutive naturals, for example, 6865 + ... + 10242.

It is an arithmetic number, because the mean of its divisors is an integer number (4824456).

Almost surely, 2^28893723 is an apocalyptic number.

28893723 is a deficient number, since it is larger than the sum of its proper divisors (9701925).

28893723 is a wasteful number, since it uses less digits than its factorization.

28893723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17673.

The product of its digits is 145152, while the sum is 42.

The square root of 28893723 is about 5375.2881783212. The cubic root of 28893723 is about 306.8559167137.

The spelling of 28893723 in words is "twenty-eight million, eight hundred ninety-three thousand, seven hundred twenty-three".