28591923 has 8 divisors (see below), whose sum is σ = 38582208. Its totient is φ = 18831464.

The previous prime is 28591919. The next prime is 28591939. The reversal of 28591923 is 32919582.

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 28591923 - 2² = 28591919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28591973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57165 + ... + 57662.

It is an arithmetic number, because the mean of its divisors is an integer number (4822776).

Almost surely, 2^28591923 is an apocalyptic number.

28591923 is a deficient number, since it is larger than the sum of its proper divisors (9990285).

28591923 is a wasteful number, since it uses less digits than its factorization.

28591923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114913.

The product of its digits is 38880, while the sum is 39.

The square root of 28591923 is about 5347.1415728406. The cubic root of 28591923 is about 305.7837872025.

The spelling of 28591923 in words is "twenty-eight million, five hundred ninety-one thousand, nine hundred twenty-three".