161285072 has 80 divisors (see below), whose sum is σ = 364143360. Its totient is φ = 68553216.

The previous prime is 161285071. The next prime is 161285083. The reversal of 161285072 is 270582161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161285071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145673 + ... + 146775.

It is an arithmetic number, because the mean of its divisors is an integer number (4551792).

Almost surely, 2^161285072 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 161285072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182071680).

161285072 is an abundant number, since it is smaller than the sum of its proper divisors (202858288).

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

161285072 is a wasteful number, since it uses less digits than its factorization.

161285072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 161285072 is about 12699.8059827700. The cubic root of 161285072 is about 544.3330752937. Note that the first 3 decimals are identical.

The spelling of 161285072 in words is "one hundred sixty-one million, two hundred eighty-five thousand, seventy-two".