28656879719 has 8 divisors (see below), whose sum is σ = 32676623280. Its totient is φ = 24896474496.

The previous prime is 28656879703. The next prime is 28656879721. The reversal of 28656879719 is 91797865682.

It is a happy number.

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 28656879719 - 2⁴ = 28656879703 is a prime.

It is a super-3 number, since 3×28656879719³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28656879749) 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, 64834349 + ... + 64834790.

It is an arithmetic number, because the mean of its divisors is an integer number (4084577910).

Almost surely, 2^28656879719 is an apocalyptic number.

28656879719 is a deficient number, since it is larger than the sum of its proper divisors (4019743561).

28656879719 is a wasteful number, since it uses less digits than its factorization.

28656879719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129669169.

The product of its digits is 91445760, while the sum is 68.

The spelling of 28656879719 in words is "twenty-eight billion, six hundred fifty-six million, eight hundred seventy-nine thousand, seven hundred nineteen".