8169091020 has 144 divisors (see below), whose sum is σ = 25276043520. Its totient is φ = 2135145600.

The previous prime is 8169090913. The next prime is 8169091027. The reversal of 8169091020 is 201909618.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (8169091027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2285835 + ... + 2289405.

It is an arithmetic number, because the mean of its divisors is an integer number (175528080).

Almost surely, 2^8169091020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8169091020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12638021760).

8169091020 is an abundant number, since it is smaller than the sum of its proper divisors (17106952500).

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

8169091020 is a wasteful number, since it uses less digits than its factorization.

8169091020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836 (or 3831 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 8169091020 is about 90383.0239591484. The cubic root of 8169091020 is about 2013.9927909209.

The spelling of 8169091020 in words is "eight billion, one hundred sixty-nine million, ninety-one thousand, twenty".