8120404840 has 64 divisors (see below), whose sum is σ = 19722787200. Its totient is φ = 2999791872.

The previous prime is 8120404801. The next prime is 8120404847. The reversal of 8120404840 is 484040218.

It is not an unprimeable number, because it can be changed into a prime (8120404847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125502 + ... + 178861.

It is an arithmetic number, because the mean of its divisors is an integer number (308168550).

Almost surely, 2^8120404840 is an apocalyptic number.

It is an amenable number.

8120404840 is an abundant number, since it is smaller than the sum of its proper divisors (11602382360).

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

8120404840 is a wasteful number, since it uses less digits than its factorization.

8120404840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304426 (or 304422 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 8120404840 is about 90113.2889201143. The cubic root of 8120404840 is about 2009.9838154518.

The spelling of 8120404840 in words is "eight billion, one hundred twenty million, four hundred four thousand, eight hundred forty".