28199807 has 2 divisors, whose sum is σ = 28199808. Its totient is φ = 28199806.

The previous prime is 28199797. The next prime is 28199833. The reversal of 28199807 is 70899182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28199807 - 2¹⁰ = 28198783 is a prime.

It is a super-2 number, since 2×28199807² = 1590458229674498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28199837) 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, 14099903 + 14099904.

It is an arithmetic number, because the mean of its divisors is an integer number (14099904).

Almost surely, 2^28199807 is an apocalyptic number.

28199807 is a deficient number, since it is larger than the sum of its proper divisors (1).

28199807 is an equidigital number, since it uses as much as digits as its factorization.

28199807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 28199807 is about 5310.3490469083. The cubic root of 28199807 is about 304.3794855468.

The spelling of 28199807 in words is "twenty-eight million, one hundred ninety-nine thousand, eight hundred seven".