28857623771 has 2 divisors, whose sum is σ = 28857623772. Its totient is φ = 28857623770.

The previous prime is 28857623731. The next prime is 28857623827. The reversal of 28857623771 is 17732675882.

It is an a-pointer prime, because the next prime (28857623827) can be obtained adding 28857623771 to its sum of digits (56).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28857623771 - 2³⁰ = 27783881947 is a prime.

It is not a weakly prime, because it can be changed into another prime (28857623701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14428811885 + 14428811886.

It is an arithmetic number, because the mean of its divisors is an integer number (14428811886).

Almost surely, 2^28857623771 is an apocalyptic number.

28857623771 is a deficient number, since it is larger than the sum of its proper divisors (1).

28857623771 is an equidigital number, since it uses as much as digits as its factorization.

28857623771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7902720, while the sum is 56.

The spelling of 28857623771 in words is "twenty-eight billion, eight hundred fifty-seven million, six hundred twenty-three thousand, seven hundred seventy-one".