28511423 has 4 divisors (see below), whose sum is σ = 29282040. Its totient is φ = 27740808.

The previous prime is 28511411. The next prime is 28511443. The reversal of 28511423 is 32411582.

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 28511423 - 2⁴ = 28511407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28511392 and 28511401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28511443) 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, 385253 + ... + 385326.

It is an arithmetic number, because the mean of its divisors is an integer number (7320510).

Almost surely, 2^28511423 is an apocalyptic number.

28511423 is a deficient number, since it is larger than the sum of its proper divisors (770617).

28511423 is an equidigital number, since it uses as much as digits as its factorization.

28511423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770616.

The product of its digits is 1920, while the sum is 26.

The square root of 28511423 is about 5339.6088808077. The cubic root of 28511423 is about 305.4965413644.

The spelling of 28511423 in words is "twenty-eight million, five hundred eleven thousand, four hundred twenty-three".