28117557617731 has 2 divisors, whose sum is σ = 28117557617732. Its totient is φ = 28117557617730.

The previous prime is 28117557617707. The next prime is 28117557617749. The reversal of 28117557617731 is 13771675571182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28117557617731 - 2¹⁷ = 28117557486659 is a prime.

It is a super-2 number, since 2×28117557617731² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28117557617731.

It is not a weakly prime, because it can be changed into another prime (28117557617701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14058778808865 + 14058778808866.

It is an arithmetic number, because the mean of its divisors is an integer number (14058778808866).

Almost surely, 2^{28117557617731} is an apocalyptic number.

28117557617731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28117557617731 is an equidigital number, since it uses as much as digits as its factorization.

28117557617731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17287200, while the sum is 61.

The spelling of 28117557617731 in words is "twenty-eight trillion, one hundred seventeen billion, five hundred fifty-seven million, six hundred seventeen thousand, seven hundred thirty-one".