28504423 has 4 divisors (see below), whose sum is σ = 28662088. Its totient is φ = 28346760.

The previous prime is 28504417. The next prime is 28504433. The reversal of 28504423 is 32440582.

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 28504423 - 2⁵ = 28504391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28504391 and 28504400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28504403) 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, 78561 + ... + 78922.

It is an arithmetic number, because the mean of its divisors is an integer number (7165522).

Almost surely, 2^28504423 is an apocalyptic number.

28504423 is a deficient number, since it is larger than the sum of its proper divisors (157665).

28504423 is a wasteful number, since it uses less digits than its factorization.

28504423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157664.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 28504423 is about 5338.9533618491. The cubic root of 28504423 is about 305.4715379261.

The spelling of 28504423 in words is "twenty-eight million, five hundred four thousand, four hundred twenty-three".