28155599 has 2 divisors, whose sum is σ = 28155600. Its totient is φ = 28155598.

The previous prime is 28155593. The next prime is 28155601. The reversal of 28155599 is 99555182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28155599 - 2²⁰ = 27107023 is a prime.

Together with 28155601, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28155593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14077799 + 14077800.

It is an arithmetic number, because the mean of its divisors is an integer number (14077800).

Almost surely, 2^28155599 is an apocalyptic number.

28155599 is a deficient number, since it is larger than the sum of its proper divisors (1).

28155599 is an equidigital number, since it uses as much as digits as its factorization.

28155599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 44.

The square root of 28155599 is about 5306.1849760445. The cubic root of 28155599 is about 304.2203467986.

The spelling of 28155599 in words is "twenty-eight million, one hundred fifty-five thousand, five hundred ninety-nine".