7918638108 has 12 divisors (see below), whose sum is σ = 18476822280. Its totient is φ = 2639546032.

The previous prime is 7918638083. The next prime is 7918638121. The reversal of 7918638108 is 8018368197.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329943243 + ... + 329943266.

It is an arithmetic number, because the mean of its divisors is an integer number (1539735190).

Almost surely, 2^7918638108 is an apocalyptic number.

It is an amenable number.

7918638108 is an abundant number, since it is smaller than the sum of its proper divisors (10558184172).

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

7918638108 is a wasteful number, since it uses less digits than its factorization.

7918638108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659886516 (or 659886514 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 7918638108 is about 88986.7299545275. The cubic root of 7918638108 is about 1993.1967263074.

The spelling of 7918638108 in words is "seven billion, nine hundred eighteen million, six hundred thirty-eight thousand, one hundred eight".