28991166813 has 64 divisors (see below), whose sum is σ = 50462200320. Its totient is φ = 16102665216.

The previous prime is 28991166811. The next prime is 28991166821. The reversal of 28991166813 is 31866119982.

It is not a de Polignac number, because 28991166813 - 2¹ = 28991166811 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28991166813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28991166811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12425395 + ... + 12427727.

It is an arithmetic number, because the mean of its divisors is an integer number (788471880).

Almost surely, 2^28991166813 is an apocalyptic number.

It is an amenable number.

28991166813 is a deficient number, since it is larger than the sum of its proper divisors (21471033507).

28991166813 is a wasteful number, since it uses less digits than its factorization.

28991166813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163 (or 4157 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The spelling of 28991166813 in words is "twenty-eight billion, nine hundred ninety-one million, one hundred sixty-six thousand, eight hundred thirteen".