28231923 has 8 divisors (see below), whose sum is σ = 37720000. Its totient is φ = 18782568.

The previous prime is 28231921. The next prime is 28231927. The reversal of 28231923 is 32913282.

It is a happy number.

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

It is not a de Polignac number, because 28231923 - 2¹ = 28231921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28231921) 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, 7933 + ... + 10926.

It is an arithmetic number, because the mean of its divisors is an integer number (4715000).

Almost surely, 2^28231923 is an apocalyptic number.

28231923 is a deficient number, since it is larger than the sum of its proper divisors (9488077).

28231923 is a wasteful number, since it uses less digits than its factorization.

28231923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19361.

The product of its digits is 5184, while the sum is 30.

The square root of 28231923 is about 5313.3720931250. The cubic root of 28231923 is about 304.4949915726.

The spelling of 28231923 in words is "twenty-eight million, two hundred thirty-one thousand, nine hundred twenty-three".