161628 has 12 divisors (see below), whose sum is σ = 377160. Its totient is φ = 53872.

The previous prime is 161627. The next prime is 161639. The reversal of 161628 is 826161.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×161628² = 52247220768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161598 and 161607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6723 + ... + 6746.

It is an arithmetic number, because the mean of its divisors is an integer number (31430).

2¹⁶¹⁶²⁸ is an apocalyptic number.

It is an amenable number.

161628 is an abundant number, since it is smaller than the sum of its proper divisors (215532).

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

161628 is a wasteful number, since it uses less digits than its factorization.

161628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13476 (or 13474 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 161628 is about 402.0298496381. The cubic root of 161628 is about 54.4718593325.

Subtracting from 161628 its sum of digits (24), we obtain a square (161604 = 402²).

Adding to 161628 its reverse (826161), we get a palindrome (987789).

The spelling of 161628 in words is "one hundred sixty-one thousand, six hundred twenty-eight".