28717162991 has 8 divisors (see below), whose sum is σ = 31795394304. Its totient is φ = 25716861720.

The previous prime is 28717162987. The next prime is 28717162993. The reversal of 28717162991 is 19926171782.

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

It is not a de Polignac number, because 28717162991 - 2² = 28717162987 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 (28717162993) 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, 19481735 + ... + 19483208.

It is an arithmetic number, because the mean of its divisors is an integer number (3974424288).

Almost surely, 2^28717162991 is an apocalyptic number.

28717162991 is a deficient number, since it is larger than the sum of its proper divisors (3078231313).

28717162991 is a wasteful number, since it uses less digits than its factorization.

28717162991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38965021.

The product of its digits is 762048, while the sum is 53.

The spelling of 28717162991 in words is "twenty-eight billion, seven hundred seventeen million, one hundred sixty-two thousand, nine hundred ninety-one".