28697840063729 has 2 divisors, whose sum is σ = 28697840063730. Its totient is φ = 28697840063728.

The previous prime is 28697840063713. The next prime is 28697840063873. The reversal of 28697840063729 is 92736004879682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21870802684129 + 6827037379600 = 4676623^2 + 2612860^2 .

It is a cyclic number.

It is not a de Polignac number, because 28697840063729 - 2⁴ = 28697840063713 is a prime.

It is not a weakly prime, because it can be changed into another prime (28697840063429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14348920031864 + 14348920031865.

It is an arithmetic number, because the mean of its divisors is an integer number (14348920031865).

Almost surely, 2^{28697840063729} is an apocalyptic number.

It is an amenable number.

28697840063729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28697840063729 is an equidigital number, since it uses as much as digits as its factorization.

28697840063729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 438939648, while the sum is 71.

The spelling of 28697840063729 in words is "twenty-eight trillion, six hundred ninety-seven billion, eight hundred forty million, sixty-three thousand, seven hundred twenty-nine".