161872256 has 96 divisors (see below), whose sum is σ = 399452400. Its totient is φ = 63977472.

The previous prime is 161872241. The next prime is 161872273. The reversal of 161872256 is 652278161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150890 + ... + 151958.

Almost surely, 2^161872256 is an apocalyptic number.

161872256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161872256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199726200).

161872256 is an abundant number, since it is smaller than the sum of its proper divisors (237580144).

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

161872256 is a wasteful number, since it uses less digits than its factorization.

161872256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116 (or 1091 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 161872256 is about 12722.9028134306. The cubic root of 161872256 is about 544.9928523598.

The spelling of 161872256 in words is "one hundred sixty-one million, eight hundred seventy-two thousand, two hundred fifty-six".