28508923 has 4 divisors (see below), whose sum is σ = 28852488. Its totient is φ = 28165360.

The previous prime is 28508903. The next prime is 28508947. The reversal of 28508923 is 32980582.

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 28508923 - 2¹⁷ = 28377851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28508903) 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, 171658 + ... + 171823.

It is an arithmetic number, because the mean of its divisors is an integer number (7213122).

Almost surely, 2^28508923 is an apocalyptic number.

28508923 is a deficient number, since it is larger than the sum of its proper divisors (343565).

28508923 is an equidigital number, since it uses as much as digits as its factorization.

28508923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343564.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 28508923 is about 5339.3747761325. The cubic root of 28508923 is about 305.4876120349.

The spelling of 28508923 in words is "twenty-eight million, five hundred eight thousand, nine hundred twenty-three".