28971587699 has 2 divisors, whose sum is σ = 28971587700. Its totient is φ = 28971587698.

The previous prime is 28971587683. The next prime is 28971587707. The reversal of 28971587699 is 99678517982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28971587699 - 2⁴ = 28971587683 is a prime.

It is a super-2 number, since 2×28971587699² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28971580699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14485793849 + 14485793850.

It is an arithmetic number, because the mean of its divisors is an integer number (14485793850).

Almost surely, 2^28971587699 is an apocalyptic number.

28971587699 is a deficient number, since it is larger than the sum of its proper divisors (1).

28971587699 is an equidigital number, since it uses as much as digits as its factorization.

28971587699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137168640, while the sum is 71.

The spelling of 28971587699 in words is "twenty-eight billion, nine hundred seventy-one million, five hundred eighty-seven thousand, six hundred ninety-nine".