28948718693 has 2 divisors, whose sum is σ = 28948718694. Its totient is φ = 28948718692.

The previous prime is 28948718671. The next prime is 28948718741. The reversal of 28948718693 is 39681784982.

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., 20708073409 + 8240645284 = 143903^2 + 90778^2 .

It is a cyclic number.

It is not a de Polignac number, because 28948718693 - 2¹⁰ = 28948717669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28948718593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14474359346 + 14474359347.

It is an arithmetic number, because the mean of its divisors is an integer number (14474359347).

Almost surely, 2^28948718693 is an apocalyptic number.

It is an amenable number.

28948718693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28948718693 is an equidigital number, since it uses as much as digits as its factorization.

28948718693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41803776, while the sum is 65.

The spelling of 28948718693 in words is "twenty-eight billion, nine hundred forty-eight million, seven hundred eighteen thousand, six hundred ninety-three".