28214653681 has 2 divisors, whose sum is σ = 28214653682. Its totient is φ = 28214653680.

The previous prime is 28214653669. The next prime is 28214653703. The reversal of 28214653681 is 18635641282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28143082081 + 71571600 = 167759^2 + 8460^2 .

It is a cyclic number.

It is not a de Polignac number, because 28214653681 - 2⁹ = 28214653169 is a prime.

It is a super-2 number, since 2×28214653681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28214653601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14107326840 + 14107326841.

It is an arithmetic number, because the mean of its divisors is an integer number (14107326841).

Almost surely, 2^28214653681 is an apocalyptic number.

It is an amenable number.

28214653681 is a deficient number, since it is larger than the sum of its proper divisors (1).

28214653681 is an equidigital number, since it uses as much as digits as its factorization.

28214653681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 46.

The spelling of 28214653681 in words is "twenty-eight billion, two hundred fourteen million, six hundred fifty-three thousand, six hundred eighty-one".