7981878341 has 4 divisors (see below), whose sum is σ = 8010283884. Its totient is φ = 7953472800.

The previous prime is 7981878293. The next prime is 7981878361. The reversal of 7981878341 is 1438781897.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5874609316 + 2107269025 = 76646^2 + 45905^2 .

It is a cyclic number.

It is not a de Polignac number, because 7981878341 - 2²⁶ = 7914769477 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 (7981878361) 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 3 ways as a sum of consecutive naturals, for example, 14202350 + ... + 14202911.

It is an arithmetic number, because the mean of its divisors is an integer number (2002570971).

Almost surely, 2^7981878341 is an apocalyptic number.

It is an amenable number.

7981878341 is a deficient number, since it is larger than the sum of its proper divisors (28405543).

7981878341 is a wasteful number, since it uses less digits than its factorization.

7981878341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28405542.

The product of its digits is 2709504, while the sum is 56.

The square root of 7981878341 is about 89341.3585132888. The cubic root of 7981878341 is about 1998.4887200541.

The spelling of 7981878341 in words is "seven billion, nine hundred eighty-one million, eight hundred seventy-eight thousand, three hundred forty-one".