7281787988887 has 2 divisors, whose sum is σ = 7281787988888. Its totient is φ = 7281787988886.

The previous prime is 7281787988857. The next prime is 7281787988903. The reversal of 7281787988887 is 7888897871827.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7281787988887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7281787988798 and 7281787988807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7281787988857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3640893994443 + 3640893994444.

It is an arithmetic number, because the mean of its divisors is an integer number (3640893994444).

Almost surely, 2^{7281787988887} is an apocalyptic number.

7281787988887 is a deficient number, since it is larger than the sum of its proper divisors (1).

7281787988887 is an equidigital number, since it uses as much as digits as its factorization.

7281787988887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11329339392, while the sum is 88.

The spelling of 7281787988887 in words is "seven trillion, two hundred eighty-one billion, seven hundred eighty-seven million, nine hundred eighty-eight thousand, eight hundred eighty-seven".