28439694697 has 2 divisors, whose sum is σ = 28439694698. Its totient is φ = 28439694696.

The previous prime is 28439694671. The next prime is 28439694719. The reversal of 28439694697 is 79649693482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21699941481 + 6739753216 = 147309^2 + 82096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28439694697 is a prime.

It is not a weakly prime, because it can be changed into another prime (28439694607) 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, 14219847348 + 14219847349.

It is an arithmetic number, because the mean of its divisors is an integer number (14219847349).

Almost surely, 2^28439694697 is an apocalyptic number.

It is an amenable number.

28439694697 is a deficient number, since it is larger than the sum of its proper divisors (1).

28439694697 is an equidigital number, since it uses as much as digits as its factorization.

28439694697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141087744, while the sum is 67.

The spelling of 28439694697 in words is "twenty-eight billion, four hundred thirty-nine million, six hundred ninety-four thousand, six hundred ninety-seven".