28323719 has 4 divisors (see below), whose sum is σ = 28368144. Its totient is φ = 28279296.

The previous prime is 28323689. The next prime is 28323727. The reversal of 28323719 is 91732382.

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 28323719 - 2¹² = 28319623 is a prime.

It is a super-2 number, since 2×28323719² = 1604466115981922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28322719) 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, 21242 + ... + 22535.

It is an arithmetic number, because the mean of its divisors is an integer number (7092036).

Almost surely, 2^28323719 is an apocalyptic number.

28323719 is a deficient number, since it is larger than the sum of its proper divisors (44425).

28323719 is an equidigital number, since it uses as much as digits as its factorization.

28323719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44424.

The product of its digits is 18144, while the sum is 35.

The square root of 28323719 is about 5322.0032882365. The cubic root of 28323719 is about 304.8246560001.

Subtracting from 28323719 its sum of digits (35), we obtain a square (28323684 = 5322²).

The spelling of 28323719 in words is "twenty-eight million, three hundred twenty-three thousand, seven hundred nineteen".