28646173691 has 2 divisors, whose sum is σ = 28646173692. Its totient is φ = 28646173690.

The previous prime is 28646173667. The next prime is 28646173733. The reversal of 28646173691 is 19637164682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28646173691 - 2¹⁴ = 28646157307 is a prime.

It is not a weakly prime, because it can be changed into another prime (28646170691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14323086845 + 14323086846.

It is an arithmetic number, because the mean of its divisors is an integer number (14323086846).

Almost surely, 2^28646173691 is an apocalyptic number.

28646173691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28646173691 is an equidigital number, since it uses as much as digits as its factorization.

28646173691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

Subtracting from 28646173691 its reverse (19637164682), we obtain a palindrome (9009009009).

The spelling of 28646173691 in words is "twenty-eight billion, six hundred forty-six million, one hundred seventy-three thousand, six hundred ninety-one".