28165780189817 has 8 divisors (see below), whose sum is σ = 29823263525376. Its totient is φ = 26508371602752.

The previous prime is 28165780189777. The next prime is 28165780189829. The reversal of 28165780189817 is 71898108756182.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28165780189817 is a prime.

It is a super-2 number, since 2×28165780189817² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28165780180817) 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, 17910413 + ... + 19419434.

It is an arithmetic number, because the mean of its divisors is an integer number (3727907940672).

Almost surely, 2^{28165780189817} is an apocalyptic number.

It is an amenable number.

28165780189817 is a deficient number, since it is larger than the sum of its proper divisors (1657483335559).

28165780189817 is a wasteful number, since it uses less digits than its factorization.

28165780189817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37374247.

The product of its (nonzero) digits is 108380160, while the sum is 71.

The spelling of 28165780189817 in words is "twenty-eight trillion, one hundred sixty-five billion, seven hundred eighty million, one hundred eighty-nine thousand, eight hundred seventeen".