28144607797 has 2 divisors, whose sum is σ = 28144607798. Its totient is φ = 28144607796.

The previous prime is 28144607767. The next prime is 28144607819. The reversal of 28144607797 is 79770644182.

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., 21257931601 + 6886676196 = 145801^2 + 82986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28144607797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28144607707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14072303898 + 14072303899.

It is an arithmetic number, because the mean of its divisors is an integer number (14072303899).

Almost surely, 2^28144607797 is an apocalyptic number.

It is an amenable number.

28144607797 is a deficient number, since it is larger than the sum of its proper divisors (1).

28144607797 is an equidigital number, since it uses as much as digits as its factorization.

28144607797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 55.

The spelling of 28144607797 in words is "twenty-eight billion, one hundred forty-four million, six hundred seven thousand, seven hundred ninety-seven".