7939856640 has 576 divisors, whose sum is σ = 28185615360. Its totient is φ = 1899233280.

The previous prime is 7939856633. The next prime is 7939856699. The reversal of 7939856640 is 466589397.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 168933097 + ... + 168933143.

It is an arithmetic number, because the mean of its divisors is an integer number (48933360).

Almost surely, 2^7939856640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7939856640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14092807680).

7939856640 is an abundant number, since it is smaller than the sum of its proper divisors (20245758720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7939856640 is a wasteful number, since it uses less digits than its factorization.

7939856640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 57.

The square root of 7939856640 is about 89105.8732071012. The cubic root of 7939856640 is about 1994.9754408067.

The spelling of 7939856640 in words is "seven billion, nine hundred thirty-nine million, eight hundred fifty-six thousand, six hundred forty".