28763791639 has 16 divisors (see below), whose sum is σ = 32117439744. Its totient is φ = 25540228800.

The previous prime is 28763791603. The next prime is 28763791643. The reversal of 28763791639 is 93619736782.

It is a cyclic number.

It is not a de Polignac number, because 28763791639 - 2¹⁵ = 28763758871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28763791439) 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 15 ways as a sum of consecutive naturals, for example, 91177 + ... + 256594.

It is an arithmetic number, because the mean of its divisors is an integer number (2007339984).

Almost surely, 2^28763791639 is an apocalyptic number.

28763791639 is a deficient number, since it is larger than the sum of its proper divisors (3353648105).

28763791639 is a wasteful number, since it uses less digits than its factorization.

28763791639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347958.

The product of its digits is 20575296, while the sum is 61.

The spelling of 28763791639 in words is "twenty-eight billion, seven hundred sixty-three million, seven hundred ninety-one thousand, six hundred thirty-nine".