28765123 has 4 divisors (see below), whose sum is σ = 28813120. Its totient is φ = 28717128.

The previous prime is 28765097. The next prime is 28765141. The reversal of 28765123 is 32156782.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28765123 - 2⁵ = 28765091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28765223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23088 + ... + 24301.

It is an arithmetic number, because the mean of its divisors is an integer number (7203280).

Almost surely, 2^28765123 is an apocalyptic number.

28765123 is a deficient number, since it is larger than the sum of its proper divisors (47997).

28765123 is an equidigital number, since it uses as much as digits as its factorization.

28765123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47996.

The product of its digits is 20160, while the sum is 34.

The square root of 28765123 is about 5363.3126890011. The cubic root of 28765123 is about 306.3999888369.

The spelling of 28765123 in words is "twenty-eight million, seven hundred sixty-five thousand, one hundred twenty-three".