28691794439 has 16 divisors (see below), whose sum is σ = 35775545856. Its totient is φ = 22354768800.

The previous prime is 28691794403. The next prime is 28691794441. The reversal of 28691794439 is 93449719682.

It is a de Polignac number, because none of the positive numbers 2^k-28691794439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28691794499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1016414 + ... + 1044260.

It is an arithmetic number, because the mean of its divisors is an integer number (2235971616).

Almost surely, 2^28691794439 is an apocalyptic number.

28691794439 is a deficient number, since it is larger than the sum of its proper divisors (7083751417).

28691794439 is a wasteful number, since it uses less digits than its factorization.

28691794439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41246.

The product of its digits is 23514624, while the sum is 62.

The spelling of 28691794439 in words is "twenty-eight billion, six hundred ninety-one million, seven hundred ninety-four thousand, four hundred thirty-nine".