28424257861 has 2 divisors, whose sum is σ = 28424257862. Its totient is φ = 28424257860.

The previous prime is 28424257853. The next prime is 28424257949. The reversal of 28424257861 is 16875242482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27450193761 + 974064100 = 165681^2 + 31210^2 .

It is a cyclic number.

It is not a de Polignac number, because 28424257861 - 2³ = 28424257853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28424254861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14212128930 + 14212128931.

It is an arithmetic number, because the mean of its divisors is an integer number (14212128931).

Almost surely, 2^28424257861 is an apocalyptic number.

It is an amenable number.

28424257861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28424257861 is an equidigital number, since it uses as much as digits as its factorization.

28424257861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1720320, while the sum is 49.

The spelling of 28424257861 in words is "twenty-eight billion, four hundred twenty-four million, two hundred fifty-seven thousand, eight hundred sixty-one".