28765971608549 has 16 divisors (see below), whose sum is σ = 34690207944960. Its totient is φ = 23319528650880.

The previous prime is 28765971608519. The next prime is 28765971608573. The reversal of 28765971608549 is 94580617956782.

It is not a de Polignac number, because 28765971608549 - 2²⁸ = 28765703173093 is a prime.

It is a super-2 number, since 2×28765971608549² (a number of 28 digits) contains 22 as substring.

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 28765971608549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28765971608519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1003753262 + ... + 1003781919.

It is an arithmetic number, because the mean of its divisors is an integer number (2168137996560).

Almost surely, 2^{28765971608549} is an apocalyptic number.

It is an amenable number.

28765971608549 is a deficient number, since it is larger than the sum of its proper divisors (5924236336411).

28765971608549 is a wasteful number, since it uses less digits than its factorization.

28765971608549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007535300.

The product of its (nonzero) digits is 1828915200, while the sum is 77.

The spelling of 28765971608549 in words is "twenty-eight trillion, seven hundred sixty-five billion, nine hundred seventy-one million, six hundred eight thousand, five hundred forty-nine".