7638888893 has 2 divisors, whose sum is σ = 7638888894. Its totient is φ = 7638888892.

The previous prime is 7638888857. The next prime is 7638888913. The reversal of 7638888893 is 3988888367.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6953391769 + 685497124 = 83387^2 + 26182^2 .

It is a cyclic number.

It is not a de Polignac number, because 7638888893 - 2¹⁰ = 7638887869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7638881893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3819444446 + 3819444447.

It is an arithmetic number, because the mean of its divisors is an integer number (3819444447).

Almost surely, 2^7638888893 is an apocalyptic number.

It is an amenable number.

7638888893 is a deficient number, since it is larger than the sum of its proper divisors (1).

7638888893 is an equidigital number, since it uses as much as digits as its factorization.

7638888893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111476736, while the sum is 68.

The square root of 7638888893 is about 87400.7373710314. The cubic root of 7638888893 is about 1969.4429177991.

The spelling of 7638888893 in words is "seven billion, six hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-three".