628161 has 8 divisors (see below), whose sum is σ = 858144. Its totient is φ = 408480.

The previous prime is 628139. The next prime is 628171. The reversal of 628161 is 161826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 628161 - 2⁶ = 628097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (628171) 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, 2431 + ... + 2676.

It is an arithmetic number, because the mean of its divisors is an integer number (107268).

2⁶²⁸¹⁶¹ is an apocalyptic number.

It is an amenable number.

628161 is a deficient number, since it is larger than the sum of its proper divisors (229983).

628161 is a wasteful number, since it uses less digits than its factorization.

628161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151.

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

The square root of 628161 is about 792.5660855727. The cubic root of 628161 is about 85.6426945867.

Adding to 628161 its reverse (161826), we get a palindrome (789987).

The spelling of 628161 in words is "six hundred twenty-eight thousand, one hundred sixty-one".