28291372917 has 8 divisors (see below), whose sum is σ = 38433563424. Its totient is φ = 18505048848.

The previous prime is 28291372909. The next prime is 28291372931. The reversal of 28291372917 is 71927319282.

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

It is not a de Polignac number, because 28291372917 - 2³ = 28291372909 is a prime.

It is a super-3 number, since 3×28291372917³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28291372917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28291372957) 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, 88966423 + ... + 88966740.

It is an arithmetic number, because the mean of its divisors is an integer number (4804195428).

Almost surely, 2^28291372917 is an apocalyptic number.

It is an amenable number.

28291372917 is a deficient number, since it is larger than the sum of its proper divisors (10142190507).

28291372917 is a wasteful number, since it uses less digits than its factorization.

28291372917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177933219.

The product of its digits is 762048, while the sum is 51.

The spelling of 28291372917 in words is "twenty-eight billion, two hundred ninety-one million, three hundred seventy-two thousand, nine hundred seventeen".