28321499 has 2 divisors, whose sum is σ = 28321500. Its totient is φ = 28321498.

The previous prime is 28321493. The next prime is 28321523. The reversal of 28321499 is 99412382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28321499 - 2⁴ = 28321483 is a prime.

It is not a weakly prime, because it can be changed into another prime (28321493) 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 as a sum of consecutive naturals, namely, 14160749 + 14160750.

It is an arithmetic number, because the mean of its divisors is an integer number (14160750).

Almost surely, 2^28321499 is an apocalyptic number.

28321499 is a deficient number, since it is larger than the sum of its proper divisors (1).

28321499 is an equidigital number, since it uses as much as digits as its factorization.

28321499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 28321499 is about 5321.7947160709. The cubic root of 28321499 is about 304.8166917869.

The spelling of 28321499 in words is "twenty-eight million, three hundred twenty-one thousand, four hundred ninety-nine".