28117587541 has 2 divisors, whose sum is σ = 28117587542. Its totient is φ = 28117587540.

The previous prime is 28117587479. The next prime is 28117587557. The reversal of 28117587541 is 14578571182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14954844100 + 13162743441 = 122290^2 + 114729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28117587541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28117587581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14058793770 + 14058793771.

It is an arithmetic number, because the mean of its divisors is an integer number (14058793771).

Almost surely, 2^28117587541 is an apocalyptic number.

It is an amenable number.

28117587541 is a deficient number, since it is larger than the sum of its proper divisors (1).

28117587541 is an equidigital number, since it uses as much as digits as its factorization.

28117587541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 627200, while the sum is 49.

The spelling of 28117587541 in words is "twenty-eight billion, one hundred seventeen million, five hundred eighty-seven thousand, five hundred forty-one".