28320641137 has 2 divisors, whose sum is σ = 28320641138. Its totient is φ = 28320641136.

The previous prime is 28320641117. The next prime is 28320641161. The reversal of 28320641137 is 73114602382.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22888361521 + 5432279616 = 151289^2 + 73704^2 .

It is a cyclic number.

It is not a de Polignac number, because 28320641137 - 2⁷ = 28320641009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28320641096 and 28320641105.

It is not a weakly prime, because it can be changed into another prime (28320641117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160320568 + 14160320569.

It is an arithmetic number, because the mean of its divisors is an integer number (14160320569).

Almost surely, 2^28320641137 is an apocalyptic number.

It is an amenable number.

28320641137 is a deficient number, since it is larger than the sum of its proper divisors (1).

28320641137 is an equidigital number, since it uses as much as digits as its factorization.

28320641137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 28320641137 in words is "twenty-eight billion, three hundred twenty million, six hundred forty-one thousand, one hundred thirty-seven".