28345640971 has 2 divisors, whose sum is σ = 28345640972. Its totient is φ = 28345640970.

The previous prime is 28345640963. The next prime is 28345641043. The reversal of 28345640971 is 17904654382.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28345640971 - 2³ = 28345640963 is a prime.

It is not a weakly prime, because it can be changed into another prime (28345640671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14172820485 + 14172820486.

It is an arithmetic number, because the mean of its divisors is an integer number (14172820486).

It is a 1-persistent number, because it is pandigital, but 2⋅28345640971 = 56691281942 is not.

Almost surely, 2^28345640971 is an apocalyptic number.

28345640971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28345640971 is an equidigital number, since it uses as much as digits as its factorization.

28345640971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 28345640971 in words is "twenty-eight billion, three hundred forty-five million, six hundred forty thousand, nine hundred seventy-one".