28491738665209 has 8 divisors (see below), whose sum is σ = 30128164254720. Its totient is φ = 26900146653600.

The previous prime is 28491738665161. The next prime is 28491738665219. The reversal of 28491738665209 is 90256683719482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28491738665209 - 2³⁵ = 28457378926841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28491738665219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11208393169 + ... + 11208395710.

It is an arithmetic number, because the mean of its divisors is an integer number (3766020531840).

It is a 1-persistent number, because it is pandigital, but 2⋅28491738665209 = 56983477330418 is not.

Almost surely, 2^{28491738665209} is an apocalyptic number.

It is an amenable number.

28491738665209 is a deficient number, since it is larger than the sum of its proper divisors (1636425589511).

28491738665209 is a wasteful number, since it uses less digits than its factorization.

28491738665209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22416788951.

The product of its (nonzero) digits is 313528320, while the sum is 70.

The spelling of 28491738665209 in words is "twenty-eight trillion, four hundred ninety-one billion, seven hundred thirty-eight million, six hundred sixty-five thousand, two hundred nine".