28686294991 has 8 divisors (see below), whose sum is σ = 30424240224. Its totient is φ = 26989242720.

The previous prime is 28686294941. The next prime is 28686295007. The reversal of 28686294991 is 19949268682.

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 28686294991 - 2⁷ = 28686294863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28686294911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10221796 + ... + 10224601.

It is an arithmetic number, because the mean of its divisors is an integer number (3803030028).

Almost surely, 2^28686294991 is an apocalyptic number.

28686294991 is a deficient number, since it is larger than the sum of its proper divisors (1737945233).

28686294991 is a wasteful number, since it uses less digits than its factorization.

28686294991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20446481.

The product of its digits is 26873856, while the sum is 64.

The spelling of 28686294991 in words is "twenty-eight billion, six hundred eighty-six million, two hundred ninety-four thousand, nine hundred ninety-one".