8211611980 has 72 divisors (see below), whose sum is σ = 20370543984. Its totient is φ = 2756332800.

The previous prime is 8211611963. The next prime is 8211611999. The reversal of 8211611980 is 891161128.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73251 + ... + 147610.

It is an arithmetic number, because the mean of its divisors is an integer number (282924222).

Almost surely, 2^8211611980 is an apocalyptic number.

It is an amenable number.

8211611980 is an abundant number, since it is smaller than the sum of its proper divisors (12158932004).

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

8211611980 is a wasteful number, since it uses less digits than its factorization.

8211611980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220907 (or 220892 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 37.

The square root of 8211611980 is about 90617.9451322971. The cubic root of 8211611980 is about 2017.4810922058.

The spelling of 8211611980 in words is "eight billion, two hundred eleven million, six hundred eleven thousand, nine hundred eighty".