28879346789 has 4 divisors (see below), whose sum is σ = 29493801024. Its totient is φ = 28264892556.

The previous prime is 28879346719. The next prime is 28879346791. The reversal of 28879346789 is 98764397882.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98764397882 = 2 ⋅49382198941.

It is a cyclic number.

It is not a de Polignac number, because 28879346789 - 2²⁴ = 28862569573 is a prime.

It is a super-2 number, since 2×28879346789² (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 (28879346719) 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, 307227047 + ... + 307227140.

It is an arithmetic number, because the mean of its divisors is an integer number (7373450256).

Almost surely, 2^28879346789 is an apocalyptic number.

It is an amenable number.

28879346789 is a deficient number, since it is larger than the sum of its proper divisors (614454235).

28879346789 is an equidigital number, since it uses as much as digits as its factorization.

28879346789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614454234.

The product of its digits is 292626432, while the sum is 71.

The spelling of 28879346789 in words is "twenty-eight billion, eight hundred seventy-nine million, three hundred forty-six thousand, seven hundred eighty-nine".