28305555389 has 2 divisors, whose sum is σ = 28305555390. Its totient is φ = 28305555388.

The previous prime is 28305555329. The next prime is 28305555413. The reversal of 28305555389 is 98355550382.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15636252025 + 12669303364 = 125045^2 + 112558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28305555389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28305555389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28305555329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14152777694 + 14152777695.

It is an arithmetic number, because the mean of its divisors is an integer number (14152777695).

Almost surely, 2^28305555389 is an apocalyptic number.

It is an amenable number.

28305555389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28305555389 is an equidigital number, since it uses as much as digits as its factorization.

28305555389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480000, while the sum is 53.

The spelling of 28305555389 in words is "twenty-eight billion, three hundred five million, five hundred fifty-five thousand, three hundred eighty-nine".