207728891 has 2 divisors, whose sum is σ = 207728892. Its totient is φ = 207728890.

The previous prime is 207728863. The next prime is 207728909. The reversal of 207728891 is 198827702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 207728891 - 2¹⁰ = 207727867 is a prime.

It is not a weakly prime, because it can be changed into another prime (207728791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103864445 + 103864446.

It is an arithmetic number, because the mean of its divisors is an integer number (103864446).

Almost surely, 2^207728891 is an apocalyptic number.

207728891 is a deficient number, since it is larger than the sum of its proper divisors (1).

207728891 is an equidigital number, since it uses as much as digits as its factorization.

207728891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 207728891 is about 14412.8030237008. The cubic root of 207728891 is about 592.2416788905.

The spelling of 207728891 in words is "two hundred seven million, seven hundred twenty-eight thousand, eight hundred ninety-one".