28756423 has 4 divisors (see below), whose sum is σ = 29243880. Its totient is φ = 28268968.

The previous prime is 28756391. The next prime is 28756447. The reversal of 28756423 is 32465782.

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 28756423 - 2⁵ = 28756391 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 (28756223) 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, 243640 + ... + 243757.

It is an arithmetic number, because the mean of its divisors is an integer number (7310970).

Almost surely, 2^28756423 is an apocalyptic number.

28756423 is a deficient number, since it is larger than the sum of its proper divisors (487457).

28756423 is an equidigital number, since it uses as much as digits as its factorization.

28756423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487456.

The product of its digits is 80640, while the sum is 37.

The square root of 28756423 is about 5362.5015617713. The cubic root of 28756423 is about 306.3690955373.

The spelling of 28756423 in words is "twenty-eight million, seven hundred fifty-six thousand, four hundred twenty-three".