28671026729 has 4 divisors (see below), whose sum is σ = 28682745984. Its totient is φ = 28659307476.

The previous prime is 28671026723. The next prime is 28671026737. The reversal of 28671026729 is 92762017682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28671026729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28671026723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5855957 + ... + 5860850.

It is an arithmetic number, because the mean of its divisors is an integer number (7170686496).

Almost surely, 2^28671026729 is an apocalyptic number.

It is an amenable number.

28671026729 is a deficient number, since it is larger than the sum of its proper divisors (11719255).

28671026729 is a wasteful number, since it uses less digits than its factorization.

28671026729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11719254.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 28671026729 in words is "twenty-eight billion, six hundred seventy-one million, twenty-six thousand, seven hundred twenty-nine".