28687514117 has 2 divisors, whose sum is σ = 28687514118. Its totient is φ = 28687514116.

The previous prime is 28687514101. The next prime is 28687514131. The reversal of 28687514117 is 71141578682.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17171219521 + 11516294596 = 131039^2 + 107314^2 .

It is a cyclic number.

It is not a de Polignac number, because 28687514117 - 2⁴ = 28687514101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28687514197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343757058 + 14343757059.

It is an arithmetic number, because the mean of its divisors is an integer number (14343757059).

Almost surely, 2^28687514117 is an apocalyptic number.

It is an amenable number.

28687514117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28687514117 is an equidigital number, since it uses as much as digits as its factorization.

28687514117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 50.

The spelling of 28687514117 in words is "twenty-eight billion, six hundred eighty-seven million, five hundred fourteen thousand, one hundred seventeen".