28505323 has 8 divisors (see below), whose sum is σ = 35539200. Its totient is φ = 22211880.

The previous prime is 28505261. The next prime is 28505329. The reversal of 28505323 is 32350582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28505323 - 2¹⁷ = 28374251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28505291 and 28505300.

It is not an unprimeable number, because it can be changed into a prime (28505329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185023 + ... + 185176.

It is an arithmetic number, because the mean of its divisors is an integer number (4442400).

Almost surely, 2^28505323 is an apocalyptic number.

28505323 is a deficient number, since it is larger than the sum of its proper divisors (7033877).

28505323 is a wasteful number, since it uses less digits than its factorization.

28505323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370217.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 28505323 is about 5339.0376473668. The cubic root of 28505323 is about 305.4747528832.

The spelling of 28505323 in words is "twenty-eight million, five hundred five thousand, three hundred twenty-three".