28874457389 has 2 divisors, whose sum is σ = 28874457390. Its totient is φ = 28874457388.

The previous prime is 28874457383. The next prime is 28874457401. The reversal of 28874457389 is 98375447882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21765100900 + 7109356489 = 147530^2 + 84317^2 .

It is a cyclic number.

It is not a de Polignac number, because 28874457389 - 2⁸ = 28874457133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28874457383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14437228694 + 14437228695.

It is an arithmetic number, because the mean of its divisors is an integer number (14437228695).

Almost surely, 2^28874457389 is an apocalyptic number.

It is an amenable number.

28874457389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28874457389 is an equidigital number, since it uses as much as digits as its factorization.

28874457389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108380160, while the sum is 65.

The spelling of 28874457389 in words is "twenty-eight billion, eight hundred seventy-four million, four hundred fifty-seven thousand, three hundred eighty-nine".