8161856 has 14 divisors (see below), whose sum is σ = 16196310. Its totient is φ = 4080896.

The previous prime is 8161843. The next prime is 8161859. The reversal of 8161856 is 6581618.

It can be written as a sum of positive squares in only one way, i.e., 6760000 + 1401856 = 2600^2 + 1184^2 .

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (8161859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63701 + ... + 63828.

Almost surely, 2^8161856 is an apocalyptic number.

It is an amenable number.

8161856 is a deficient number, since it is larger than the sum of its proper divisors (8034454).

8161856 is a wasteful number, since it uses less digits than its factorization.

8161856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127541 (or 127531 counting only the distinct ones).

The product of its digits is 11520, while the sum is 35.

The square root of 8161856 is about 2856.8962179260. The cubic root of 8161856 is about 201.3398045764.

The spelling of 8161856 in words is "eight million, one hundred sixty-one thousand, eight hundred fifty-six".