8161644 has 48 divisors (see below), whose sum is σ = 20160000. Its totient is φ = 2565696.

The previous prime is 8161631. The next prime is 8161661. The reversal of 8161644 is 4461618.

8161644 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×8161644² = 133224865565472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16107 + ... + 16605.

It is an arithmetic number, because the mean of its divisors is an integer number (420000).

Almost surely, 2^8161644 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 8161644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10080000).

8161644 is an abundant number, since it is smaller than the sum of its proper divisors (11998356).

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

8161644 is a wasteful number, since it uses less digits than its factorization.

8161644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 580 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 8161644 is about 2856.8591144822. The cubic root of 8161644 is about 201.3380613288.

The spelling of 8161644 in words is "eight million, one hundred sixty-one thousand, six hundred forty-four".