7882138813 has 4 divisors (see below), whose sum is σ = 7882403068. Its totient is φ = 7881874560.

The previous prime is 7882138799. The next prime is 7882138819. The reversal of 7882138813 is 3188312887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3188312887 = 73 ⋅43675519.

It can be written as a sum of positive squares in 2 ways, for example, as 7238095929 + 644042884 = 85077^2 + 25378^2 .

It is a cyclic number.

It is not a de Polignac number, because 7882138813 - 2⁹ = 7882138301 is a prime.

It is a super-2 number, since 2×7882138813² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7882138819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80718 + ... + 149263.

It is an arithmetic number, because the mean of its divisors is an integer number (1970600767).

Almost surely, 2^7882138813 is an apocalyptic number.

It is an amenable number.

7882138813 is a deficient number, since it is larger than the sum of its proper divisors (264255).

7882138813 is a wasteful number, since it uses less digits than its factorization.

7882138813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264254.

The product of its digits is 516096, while the sum is 49.

The square root of 7882138813 is about 88781.4102895420. The cubic root of 7882138813 is about 1990.1296021751.

The spelling of 7882138813 in words is "seven billion, eight hundred eighty-two million, one hundred thirty-eight thousand, eight hundred thirteen".