28171799 has 2 divisors, whose sum is σ = 28171800. Its totient is φ = 28171798.

The previous prime is 28171783. The next prime is 28171817. The reversal of 28171799 is 99717182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28171799 - 2⁴ = 28171783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28171729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14085899 + 14085900.

It is an arithmetic number, because the mean of its divisors is an integer number (14085900).

Almost surely, 2^28171799 is an apocalyptic number.

28171799 is a deficient number, since it is larger than the sum of its proper divisors (1).

28171799 is an equidigital number, since it uses as much as digits as its factorization.

28171799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 44.

The square root of 28171799 is about 5307.7112770007. The cubic root of 28171799 is about 304.2786824391.

The spelling of 28171799 in words is "twenty-eight million, one hundred seventy-one thousand, seven hundred ninety-nine".