28696971851 has 2 divisors, whose sum is σ = 28696971852. Its totient is φ = 28696971850.

The previous prime is 28696971817. The next prime is 28696971857. The reversal of 28696971851 is 15817969682.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28696971851 is a prime.

It is not a weakly prime, because it can be changed into another prime (28696971857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14348485925 + 14348485926.

It is an arithmetic number, because the mean of its divisors is an integer number (14348485926).

Almost surely, 2^28696971851 is an apocalyptic number.

28696971851 is a deficient number, since it is larger than the sum of its proper divisors (1).

28696971851 is an equidigital number, since it uses as much as digits as its factorization.

28696971851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 62.

The spelling of 28696971851 in words is "twenty-eight billion, six hundred ninety-six million, nine hundred seventy-one thousand, eight hundred fifty-one".