28400186389 has 2 divisors, whose sum is σ = 28400186390. Its totient is φ = 28400186388.

The previous prime is 28400186357. The next prime is 28400186401. The reversal of 28400186389 is 98368100482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28242483025 + 157703364 = 168055^2 + 12558^2 .

It is a cyclic number.

It is not a de Polignac number, because 28400186389 - 2⁵ = 28400186357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28400181389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200093194 + 14200093195.

It is an arithmetic number, because the mean of its divisors is an integer number (14200093195).

Almost surely, 2^28400186389 is an apocalyptic number.

It is an amenable number.

28400186389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28400186389 is an equidigital number, since it uses as much as digits as its factorization.

28400186389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 663552, while the sum is 49.

The spelling of 28400186389 in words is "twenty-eight billion, four hundred million, one hundred eighty-six thousand, three hundred eighty-nine".