28231723 has 8 divisors (see below), whose sum is σ = 30858128. Its totient is φ = 25670304.

The previous prime is 28231699. The next prime is 28231733. The reversal of 28231723 is 32713282.

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

It is a cyclic number.

It is not a de Polignac number, because 28231723 - 2⁵ = 28231691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28231691 and 28231700.

It is not an unprimeable number, because it can be changed into a prime (28231733) 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, 15336 + ... + 17077.

It is an arithmetic number, because the mean of its divisors is an integer number (3857266).

Almost surely, 2^28231723 is an apocalyptic number.

28231723 is a deficient number, since it is larger than the sum of its proper divisors (2626405).

28231723 is a wasteful number, since it uses less digits than its factorization.

28231723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32493.

The product of its digits is 4032, while the sum is 28.

The square root of 28231723 is about 5313.3532726518. The cubic root of 28231723 is about 304.4942725386.

The spelling of 28231723 in words is "twenty-eight million, two hundred thirty-one thousand, seven hundred twenty-three".