161529728 has 64 divisors (see below), whose sum is σ = 332866800. Its totient is φ = 78041088.

The previous prime is 161529727. The next prime is 161529737. The reversal of 161529728 is 827925161.

161529728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161529721) 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, 551150 + ... + 551442.

Almost surely, 2^161529728 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 161529728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166433400).

161529728 is an abundant number, since it is smaller than the sum of its proper divisors (171337072).

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

161529728 is an equidigital number, since it uses as much as digits as its factorization.

161529728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 427 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 161529728 is about 12709.4346058351. The cubic root of 161529728 is about 544.6081721967.

The spelling of 161529728 in words is "one hundred sixty-one million, five hundred twenty-nine thousand, seven hundred twenty-eight".