28323439 has 2 divisors, whose sum is σ = 28323440. Its totient is φ = 28323438.

The previous prime is 28323437. The next prime is 28323467. The reversal of 28323439 is 93432382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28323439 - 2¹ = 28323437 is a prime.

Together with 28323437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28323437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14161719 + 14161720.

It is an arithmetic number, because the mean of its divisors is an integer number (14161720).

Almost surely, 2^28323439 is an apocalyptic number.

28323439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28323439 is an equidigital number, since it uses as much as digits as its factorization.

28323439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 34.

The square root of 28323439 is about 5321.9769822877. The cubic root of 28323439 is about 304.8236515277.

The spelling of 28323439 in words is "twenty-eight million, three hundred twenty-three thousand, four hundred thirty-nine".