7938916640 has 96 divisors (see below), whose sum is σ = 19517137920. Its totient is φ = 3049206784.

The previous prime is 7938916639. The next prime is 7938916651. The reversal of 7938916640 is 466198397.

It is a super-3 number, since 3×7938916640³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388601 + ... + 408519.

It is an arithmetic number, because the mean of its divisors is an integer number (203303520).

Almost surely, 2^7938916640 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 7938916640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9758568960).

7938916640 is an abundant number, since it is smaller than the sum of its proper divisors (11578221280).

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

7938916640 is a wasteful number, since it uses less digits than its factorization.

7938916640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20034 (or 20026 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 7938916640 is about 89100.5984267221. The cubic root of 7938916640 is about 1994.8967092876.

The spelling of 7938916640 in words is "seven billion, nine hundred thirty-eight million, nine hundred sixteen thousand, six hundred forty".