161606240 has 48 divisors (see below), whose sum is σ = 384380640. Its totient is φ = 64204800.

The previous prime is 161606239. The next prime is 161606261. The reversal of 161606240 is 42606161.

It is a happy number.

It is a super-2 number, since 2×161606240² = 52233153613875200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20816 + ... + 27504.

It is an arithmetic number, because the mean of its divisors is an integer number (8007930).

Almost surely, 2^161606240 is an apocalyptic number.

161606240 is a gapful number since it is divisible by the number (10) 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 161606240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192190320).

161606240 is an abundant number, since it is smaller than the sum of its proper divisors (222774400).

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

161606240 is a wasteful number, since it uses less digits than its factorization.

161606240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6855 (or 6847 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 161606240 is about 12712.4442968298. Note that the first 3 decimals coincide. The cubic root of 161606240 is about 544.6941470481.

The spelling of 161606240 in words is "one hundred sixty-one million, six hundred six thousand, two hundred forty".