28101923 has 4 divisors (see below), whose sum is σ = 28198128. Its totient is φ = 28005720.

The previous prime is 28101917. The next prime is 28101943. The reversal of 28101923 is 32910182.

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 28101923 - 2²⁰ = 27053347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28101892 and 28101901.

It is not an unprimeable number, because it can be changed into a prime (28101943) 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 3 ways as a sum of consecutive naturals, for example, 47663 + ... + 48248.

It is an arithmetic number, because the mean of its divisors is an integer number (7049532).

Almost surely, 2^28101923 is an apocalyptic number.

28101923 is a deficient number, since it is larger than the sum of its proper divisors (96205).

28101923 is an equidigital number, since it uses as much as digits as its factorization.

28101923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96204.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 28101923 is about 5301.1246919875. The cubic root of 28101923 is about 304.0269013302.

The spelling of 28101923 in words is "twenty-eight million, one hundred one thousand, nine hundred twenty-three".