28953668893 has 2 divisors, whose sum is σ = 28953668894. Its totient is φ = 28953668892.

The previous prime is 28953668869. The next prime is 28953668903. The reversal of 28953668893 is 39886635982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21350177689 + 7603491204 = 146117^2 + 87198^2 .

It is a cyclic number.

It is not a de Polignac number, because 28953668893 - 2²¹ = 28951571741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28953662893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14476834446 + 14476834447.

It is an arithmetic number, because the mean of its divisors is an integer number (14476834447).

Almost surely, 2^28953668893 is an apocalyptic number.

It is an amenable number.

28953668893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28953668893 is an equidigital number, since it uses as much as digits as its factorization.

28953668893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134369280, while the sum is 67.

The spelling of 28953668893 in words is "twenty-eight billion, nine hundred fifty-three million, six hundred sixty-eight thousand, eight hundred ninety-three".