28765211109 has 8 divisors (see below), whose sum is σ = 39003676320. Its totient is φ = 18851776656.

The previous prime is 28765211107. The next prime is 28765211113. The reversal of 28765211109 is 90111256782.

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

It is not a de Polignac number, because 28765211109 - 2¹ = 28765211107 is a prime.

It is a super-3 number, since 3×28765211109³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28765211107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81257482 + ... + 81257835.

It is an arithmetic number, because the mean of its divisors is an integer number (4875459540).

Almost surely, 2^28765211109 is an apocalyptic number.

It is an amenable number.

28765211109 is a deficient number, since it is larger than the sum of its proper divisors (10238465211).

28765211109 is a wasteful number, since it uses less digits than its factorization.

28765211109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162515379.

The product of its (nonzero) digits is 60480, while the sum is 42.

The spelling of 28765211109 in words is "twenty-eight billion, seven hundred sixty-five million, two hundred eleven thousand, one hundred nine".