28647786197 has 4 divisors (see below), whose sum is σ = 28648365216. Its totient is φ = 28647207180.

The previous prime is 28647786191. The next prime is 28647786253. The reversal of 28647786197 is 79168774682.

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 not a de Polignac number, because 28647786197 - 2⁸ = 28647785941 is a prime.

It is a super-3 number, since 3×28647786197³ (a number of 32 digits) contains 333 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 (28647786191) 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, 207563 + ... + 316824.

It is an arithmetic number, because the mean of its divisors is an integer number (7162091304).

Almost surely, 2^28647786197 is an apocalyptic number.

It is an amenable number.

28647786197 is a deficient number, since it is larger than the sum of its proper divisors (579019).

28647786197 is an equidigital number, since it uses as much as digits as its factorization.

28647786197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579018.

The product of its digits is 56899584, while the sum is 65.

The spelling of 28647786197 in words is "twenty-eight billion, six hundred forty-seven million, seven hundred eighty-six thousand, one hundred ninety-seven".