7788138765 has 64 divisors (see below), whose sum is σ = 13807411200. Its totient is φ = 3717043200.

The previous prime is 7788138763. The next prime is 7788138781. The reversal of 7788138765 is 5678318877.

It is not a de Polignac number, because 7788138765 - 2¹ = 7788138763 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7788138699 and 7788138708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7788138763) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5721685 + ... + 5723045.

It is an arithmetic number, because the mean of its divisors is an integer number (215740800).

Almost surely, 2^7788138765 is an apocalyptic number.

It is an amenable number.

7788138765 is a deficient number, since it is larger than the sum of its proper divisors (6019272435).

7788138765 is a wasteful number, since it uses less digits than its factorization.

7788138765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898.

The product of its digits is 15805440, while the sum is 60.

The square root of 7788138765 is about 88250.4320952595. The cubic root of 7788138765 is about 1982.1867114923.

The spelling of 7788138765 in words is "seven billion, seven hundred eighty-eight million, one hundred thirty-eight thousand, seven hundred sixty-five".