7638888969 has 12 divisors (see below), whose sum is σ = 11035316292. Its totient is φ = 5091962400.

The previous prime is 7638888947. The next prime is 7638888973. The reversal of 7638888969 is 9698888367.

It can be written as a sum of positive squares in 2 ways, for example, as 6687968400 + 950920569 = 81780^2 + 30837^2 .

It is not a de Polignac number, because 7638888969 - 2⁸ = 7638888713 is a prime.

It is a super-2 number, since 2×7638888969² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7638888897 and 7638888906.

It is not an unprimeable number, because it can be changed into a prime (7636888969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31279 + ... + 127499.

It is an arithmetic number, because the mean of its divisors is an integer number (919609691).

Almost surely, 2^7638888969 is an apocalyptic number.

It is an amenable number.

7638888969 is a deficient number, since it is larger than the sum of its proper divisors (3396427323).

7638888969 is a wasteful number, since it uses less digits than its factorization.

7638888969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105048 (or 105045 counting only the distinct ones).

The product of its digits is 250822656, while the sum is 72.

The square root of 7638888969 is about 87400.7378058103. The cubic root of 7638888969 is about 1969.4429243305.

The spelling of 7638888969 in words is "seven billion, six hundred thirty-eight million, eight hundred eighty-eight thousand, nine hundred sixty-nine".