28885745677 has 2 divisors, whose sum is σ = 28885745678. Its totient is φ = 28885745676.

The previous prime is 28885745659. The next prime is 28885745743. The reversal of 28885745677 is 77654758882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26245944036 + 2639801641 = 162006^2 + 51379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28885745677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28885755677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14442872838 + 14442872839.

It is an arithmetic number, because the mean of its divisors is an integer number (14442872839).

Almost surely, 2^28885745677 is an apocalyptic number.

It is an amenable number.

28885745677 is a deficient number, since it is larger than the sum of its proper divisors (1).

28885745677 is an equidigital number, since it uses as much as digits as its factorization.

28885745677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 210739200, while the sum is 67.

The spelling of 28885745677 in words is "twenty-eight billion, eight hundred eighty-five million, seven hundred forty-five thousand, six hundred seventy-seven".