80105890420 has 24 divisors (see below), whose sum is σ = 168263842824. Its totient is φ = 32034456576.

The previous prime is 80105890393. The next prime is 80105890421. The reversal of 80105890420 is 2409850108.

It can be written as a sum of positive squares in 4 ways, for example, as 15307133284 + 64798757136 = 123722^2 + 254556^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 80105890420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80105890421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410229 + ... + 573148.

It is an arithmetic number, because the mean of its divisors is an integer number (7010993451).

Almost surely, 2^80105890420 is an apocalyptic number.

It is an amenable number.

80105890420 is an abundant number, since it is smaller than the sum of its proper divisors (88157952404).

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

80105890420 is a wasteful number, since it uses less digits than its factorization.

80105890420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987459 (or 987457 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 80105890420 in words is "eighty billion, one hundred five million, eight hundred ninety thousand, four hundred twenty".