8081791820 has 24 divisors (see below), whose sum is σ = 16973451600. Its totient is φ = 3232395072.

The previous prime is 8081791807. The next prime is 8081791889. The reversal of 8081791820 is 281971808.

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, 386186 + ... + 406574.

It is an arithmetic number, because the mean of its divisors is an integer number (707227150).

Almost surely, 2^8081791820 is an apocalyptic number.

It is an amenable number.

8081791820 is an abundant number, since it is smaller than the sum of its proper divisors (8891659780).

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

8081791820 is a wasteful number, since it uses less digits than its factorization.

8081791820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40217 (or 40215 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 44.

The square root of 8081791820 is about 89898.7865324110. The cubic root of 8081791820 is about 2006.7928872211.

The spelling of 8081791820 in words is "eight billion, eighty-one million, seven hundred ninety-one thousand, eight hundred twenty".