7973779318 has 16 divisors (see below), whose sum is σ = 12167298000. Its totient is φ = 3918056832.

The previous prime is 7973779309. The next prime is 7973779327. The reversal of 7973779318 is 8139773797.

It is an interprime number because it is at equal distance from previous prime (7973779309) and next prime (7973779327).

It is a super-2 number, since 2×7973779318² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435778 + ... + 453706.

It is an arithmetic number, because the mean of its divisors is an integer number (760456125).

Almost surely, 2^7973779318 is an apocalyptic number.

7973779318 is a deficient number, since it is larger than the sum of its proper divisors (4193518682).

7973779318 is a wasteful number, since it uses less digits than its factorization.

7973779318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21759.

The product of its digits is 14002632, while the sum is 61.

The square root of 7973779318 is about 89296.0207288096. The cubic root of 7973779318 is about 1997.8125515736.

The spelling of 7973779318 in words is "seven billion, nine hundred seventy-three million, seven hundred seventy-nine thousand, three hundred eighteen".