161602720 has 48 divisors (see below), whose sum is σ = 383298048. Its totient is φ = 64385280.

The previous prime is 161602691. The next prime is 161602723. The reversal of 161602720 is 27206161.

It is a super-3 number, since 3×161602720³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (161602723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41497 + ... + 45223.

It is an arithmetic number, because the mean of its divisors is an integer number (7985376).

Almost surely, 2^161602720 is an apocalyptic number.

161602720 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 161602720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191649024).

161602720 is an abundant number, since it is smaller than the sum of its proper divisors (221695328).

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

161602720 is a wasteful number, since it uses less digits than its factorization.

161602720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013 (or 4005 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 161602720 is about 12712.3058490582. The cubic root of 161602720 is about 544.6901922971.

Adding to 161602720 its reverse (27206161), we get a palindrome (188808881).

The spelling of 161602720 in words is "one hundred sixty-one million, six hundred two thousand, seven hundred twenty".