28081645387 has 2 divisors, whose sum is σ = 28081645388. Its totient is φ = 28081645386.

The previous prime is 28081645373. The next prime is 28081645411. The reversal of 28081645387 is 78354618082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28081645387 - 2²⁷ = 27947427659 is a prime.

It is not a weakly prime, because it can be changed into another prime (28081645307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040822693 + 14040822694.

It is an arithmetic number, because the mean of its divisors is an integer number (14040822694).

Almost surely, 2^28081645387 is an apocalyptic number.

28081645387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28081645387 is an equidigital number, since it uses as much as digits as its factorization.

28081645387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 28081645387 in words is "twenty-eight billion, eighty-one million, six hundred forty-five thousand, three hundred eighty-seven".