28303999 has 2 divisors, whose sum is σ = 28304000. Its totient is φ = 28303998.

The previous prime is 28303987. The next prime is 28304021. The reversal of 28303999 is 99930382.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28303999 - 2⁷ = 28303871 is a prime.

It is a super-2 number, since 2×28303999² = 1602232718784002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28304999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14151999 + 14152000.

It is an arithmetic number, because the mean of its divisors is an integer number (14152000).

Almost surely, 2^28303999 is an apocalyptic number.

28303999 is a deficient number, since it is larger than the sum of its proper divisors (1).

28303999 is an equidigital number, since it uses as much as digits as its factorization.

28303999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 28303999 is about 5320.1502798323. The cubic root of 28303999 is about 304.7538962503.

The spelling of 28303999 in words is "twenty-eight million, three hundred three thousand, nine hundred ninety-nine".