28061169397 has 2 divisors, whose sum is σ = 28061169398. Its totient is φ = 28061169396.

The previous prime is 28061169361. The next prime is 28061169427. The reversal of 28061169397 is 79396116082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24901155601 + 3160013796 = 157801^2 + 56214^2 .

It is a cyclic number.

It is not a de Polignac number, because 28061169397 - 2¹¹ = 28061167349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28061161397) 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, 14030584698 + 14030584699.

It is an arithmetic number, because the mean of its divisors is an integer number (14030584699).

Almost surely, 2^28061169397 is an apocalyptic number.

It is an amenable number.

28061169397 is a deficient number, since it is larger than the sum of its proper divisors (1).

28061169397 is an equidigital number, since it uses as much as digits as its factorization.

28061169397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 28061169397 in words is "twenty-eight billion, sixty-one million, one hundred sixty-nine thousand, three hundred ninety-seven".