28991001599 has 16 divisors (see below), whose sum is σ = 33561216000. Its totient is φ = 24528888384.

The previous prime is 28991001551. The next prime is 28991001617. The reversal of 28991001599 is 99510019982.

It is not a de Polignac number, because 28991001599 - 2²⁰ = 28989953023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28991001599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28991001539) 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 15 ways as a sum of consecutive naturals, for example, 334334 + ... + 412020.

It is an arithmetic number, because the mean of its divisors is an integer number (2097576000).

Almost surely, 2^28991001599 is an apocalyptic number.

28991001599 is a deficient number, since it is larger than the sum of its proper divisors (4570214401).

28991001599 is an equidigital number, since it uses as much as digits as its factorization.

28991001599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78382.

The product of its (nonzero) digits is 524880, while the sum is 53.

The spelling of 28991001599 in words is "twenty-eight billion, nine hundred ninety-one million, one thousand, five hundred ninety-nine".