28428389287 has 2 divisors, whose sum is σ = 28428389288. Its totient is φ = 28428389286.

The previous prime is 28428389273. The next prime is 28428389317. The reversal of 28428389287 is 78298382482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28428389287 - 2⁷ = 28428389159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28428389387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14214194643 + 14214194644.

It is an arithmetic number, because the mean of its divisors is an integer number (14214194644).

Almost surely, 2^28428389287 is an apocalyptic number.

28428389287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28428389287 is an equidigital number, since it uses as much as digits as its factorization.

28428389287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24772608, while the sum is 61.

The spelling of 28428389287 in words is "twenty-eight billion, four hundred twenty-eight million, three hundred eighty-nine thousand, two hundred eighty-seven".