7979638220 has 12 divisors (see below), whose sum is σ = 16757240304. Its totient is φ = 3191855280.

The previous prime is 7979638217. The next prime is 7979638229. The reversal of 7979638220 is 228369797.

It is a super-2 number, since 2×7979638220² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7979638229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199490936 + ... + 199490975.

It is an arithmetic number, because the mean of its divisors is an integer number (1396436692).

Almost surely, 2^7979638220 is an apocalyptic number.

It is an amenable number.

7979638220 is an abundant number, since it is smaller than the sum of its proper divisors (8777602084).

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

7979638220 is a wasteful number, since it uses less digits than its factorization.

7979638220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398981920 (or 398981918 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 7979638220 is about 89328.8207691112. The cubic root of 7979638220 is about 1998.3017433704.

The spelling of 7979638220 in words is "seven billion, nine hundred seventy-nine million, six hundred thirty-eight thousand, two hundred twenty".