28513923 has 4 divisors (see below), whose sum is σ = 38018568. Its totient is φ = 19009280.

The previous prime is 28513921. The next prime is 28513943. The reversal of 28513923 is 32931582.

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 28513923 - 2¹ = 28513921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28513921) 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, 4752318 + ... + 4752323.

It is an arithmetic number, because the mean of its divisors is an integer number (9504642).

Almost surely, 2^28513923 is an apocalyptic number.

28513923 is a deficient number, since it is larger than the sum of its proper divisors (9504645).

28513923 is an equidigital number, since it uses as much as digits as its factorization.

28513923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504644.

The product of its digits is 12960, while the sum is 33.

The square root of 28513923 is about 5339.8429752194. The cubic root of 28513923 is about 305.5054701721.

The spelling of 28513923 in words is "twenty-eight million, five hundred thirteen thousand, nine hundred twenty-three".