28931696639 has 8 divisors (see below), whose sum is σ = 29720520480. Its totient is φ = 28143235296.

The previous prime is 28931696609. The next prime is 28931696641. The reversal of 28931696639 is 93669613982.

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

It is a cyclic number.

It is not a de Polignac number, because 28931696639 - 2⁸ = 28931696383 is a prime.

It is a super-2 number, since 2×28931696639² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28931696609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75257 + ... + 252045.

It is an arithmetic number, because the mean of its divisors is an integer number (3715065060).

Almost surely, 2^28931696639 is an apocalyptic number.

28931696639 is a deficient number, since it is larger than the sum of its proper divisors (788823841).

28931696639 is a wasteful number, since it uses less digits than its factorization.

28931696639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181249.

The product of its digits is 22674816, while the sum is 62.

The spelling of 28931696639 in words is "twenty-eight billion, nine hundred thirty-one million, six hundred ninety-six thousand, six hundred thirty-nine".