7881238643 has 2 divisors, whose sum is σ = 7881238644. Its totient is φ = 7881238642.

The previous prime is 7881238639. The next prime is 7881238657. The reversal of 7881238643 is 3468321887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7881238643 - 2² = 7881238639 is a prime.

It is a super-2 number, since 2×7881238643² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7881238591 and 7881238600.

It is not a weakly prime, because it can be changed into another prime (7881238693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940619321 + 3940619322.

It is an arithmetic number, because the mean of its divisors is an integer number (3940619322).

Almost surely, 2^7881238643 is an apocalyptic number.

7881238643 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881238643 is an equidigital number, since it uses as much as digits as its factorization.

7881238643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 50.

The square root of 7881238643 is about 88776.3405587322. The cubic root of 7881238643 is about 1990.0538391871.

The spelling of 7881238643 in words is "seven billion, eight hundred eighty-one million, two hundred thirty-eight thousand, six hundred forty-three".