161406720 has 108 divisors (see below), whose sum is σ = 558490296. Its totient is φ = 43038720.

The previous prime is 161406701. The next prime is 161406743. The reversal of 161406720 is 27604161.

161406720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×161406720³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4515 + ... + 18525.

Almost surely, 2^161406720 is an apocalyptic number.

161406720 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 161406720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279245148).

161406720 is an abundant number, since it is smaller than the sum of its proper divisors (397083576).

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

161406720 is a wasteful number, since it uses less digits than its factorization.

161406720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14038 (or 14021 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 161406720 is about 12704.5944445307. The cubic root of 161406720 is about 544.4698938850.

The spelling of 161406720 in words is "one hundred sixty-one million, four hundred six thousand, seven hundred twenty".