28197756117 has 24 divisors (see below), whose sum is σ = 41784780960. Its totient is φ = 18317486880.

The previous prime is 28197756107. The next prime is 28197756127. The reversal of 28197756117 is 71165779182.

28197756117 is a `hidden beast` number, since 2 + 8 + 1 + 9 + 77 + 561 + 1 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (28197756107) and next prime (28197756127).

It is not a de Polignac number, because 28197756117 - 2⁶ = 28197756053 is a prime.

It is a super-2 number, since 2×28197756117² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28197756107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181267 + ... + 298752.

It is an arithmetic number, because the mean of its divisors is an integer number (1741032540).

Almost surely, 2^28197756117 is an apocalyptic number.

It is an amenable number.

28197756117 is a deficient number, since it is larger than the sum of its proper divisors (13587024843).

28197756117 is a wasteful number, since it uses less digits than its factorization.

28197756117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480193 (or 480190 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 54.

The spelling of 28197756117 in words is "twenty-eight billion, one hundred ninety-seven million, seven hundred fifty-six thousand, one hundred seventeen".