28989319693 has 2 divisors, whose sum is σ = 28989319694. Its totient is φ = 28989319692.

The previous prime is 28989319691. The next prime is 28989319721. The reversal of 28989319693 is 39691398982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26769213769 + 2220105924 = 163613^2 + 47118^2 .

It is a cyclic number.

It is not a de Polignac number, because 28989319693 - 2¹ = 28989319691 is a prime.

It is a super-2 number, since 2×28989319693² (a number of 22 digits) contains 22 as substring.

Together with 28989319691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28989319691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14494659846 + 14494659847.

It is an arithmetic number, because the mean of its divisors is an integer number (14494659847).

Almost surely, 2^28989319693 is an apocalyptic number.

It is an amenable number.

28989319693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28989319693 is an equidigital number, since it uses as much as digits as its factorization.

28989319693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45349632, while the sum is 67.

The spelling of 28989319693 in words is "twenty-eight billion, nine hundred eighty-nine million, three hundred nineteen thousand, six hundred ninety-three".