28766723 has 4 divisors (see below), whose sum is σ = 29544240. Its totient is φ = 27989208.

The previous prime is 28766713. The next prime is 28766783. The reversal of 28766723 is 32766782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32766782 = 2 ⋅16383391.

It is a cyclic number.

It is not a de Polignac number, because 28766723 - 2¹⁶ = 28701187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28766713) 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, 388703 + ... + 388776.

It is an arithmetic number, because the mean of its divisors is an integer number (7386060).

Almost surely, 2^28766723 is an apocalyptic number.

28766723 is a deficient number, since it is larger than the sum of its proper divisors (777517).

28766723 is an equidigital number, since it uses as much as digits as its factorization.

28766723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777516.

The product of its digits is 169344, while the sum is 41.

The square root of 28766723 is about 5363.4618484706. The cubic root of 28766723 is about 306.4056696851.

The spelling of 28766723 in words is "twenty-eight million, seven hundred sixty-six thousand, seven hundred twenty-three".