28717091897 has 8 divisors (see below), whose sum is σ = 31298703744. Its totient is φ = 26188709328.

The previous prime is 28717091869. The next prime is 28717091981. The reversal of 28717091897 is 79819071782.

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 28717091897 - 2²⁴ = 28700314681 is a prime.

It is a super-4 number, since 4×28717091897⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28717091827) 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, 13306193 + ... + 13308350.

It is an arithmetic number, because the mean of its divisors is an integer number (3912337968).

Almost surely, 2^28717091897 is an apocalyptic number.

It is an amenable number.

28717091897 is a deficient number, since it is larger than the sum of its proper divisors (2581611847).

28717091897 is a wasteful number, since it uses less digits than its factorization.

28717091897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26614639.

The product of its (nonzero) digits is 3556224, while the sum is 59.

The spelling of 28717091897 in words is "twenty-eight billion, seven hundred seventeen million, ninety-one thousand, eight hundred ninety-seven".