161602320 has 160 divisors (see below), whose sum is σ = 560214144. Its totient is φ = 38195200.

The previous prime is 161602313. The next prime is 161602333. The reversal of 161602320 is 23206161.

It is a happy number.

It is a super-2 number, since 2×161602320² = 52230619658764800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107494 + ... + 108986.

Almost surely, 2^161602320 is an apocalyptic number.

161602320 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 161602320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280107072).

161602320 is an abundant number, since it is smaller than the sum of its proper divisors (398611824).

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

161602320 is a wasteful number, since it uses less digits than its factorization.

161602320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561 (or 1555 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 161602320 is about 12712.2901162615. The cubic root of 161602320 is about 544.6897428899.

Adding to 161602320 its reverse (23206161), we get a palindrome (184808481).

The spelling of 161602320 in words is "one hundred sixty-one million, six hundred two thousand, three hundred twenty".