7638888879 has 6 divisors (see below), whose sum is σ = 11033950616. Its totient is φ = 5092592580.

The previous prime is 7638888857. The next prime is 7638888893. The reversal of 7638888879 is 9788888367.

It is not a de Polignac number, because 7638888879 - 2¹⁶ = 7638823343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7638888679) 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 in 5 ways as a sum of consecutive naturals, for example, 424382707 + ... + 424382724.

Almost surely, 2^7638888879 is an apocalyptic number.

7638888879 is a deficient number, since it is larger than the sum of its proper divisors (3395061737).

7638888879 is a wasteful number, since it uses less digits than its factorization.

7638888879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848765437 (or 848765434 counting only the distinct ones).

The product of its digits is 260112384, while the sum is 72.

The square root of 7638888879 is about 87400.7372909405. The cubic root of 7638888879 is about 1969.4429165960.

The spelling of 7638888879 in words is "seven billion, six hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred seventy-nine".