166628 has 24 divisors (see below), whose sum is σ = 364224. Its totient is φ = 64800.

The previous prime is 166627. The next prime is 166631. The reversal of 166628 is 826661.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 166628.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 166628.

It is not an unprimeable number, because it can be changed into a prime (166627) 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, 38 + ... + 578.

It is an arithmetic number, because the mean of its divisors is an integer number (15176).

2¹⁶⁶⁶²⁸ 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 166628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182112).

166628 is an abundant number, since it is smaller than the sum of its proper divisors (197596).

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

166628 is a wasteful number, since it uses less digits than its factorization.

166628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 561 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 166628 is about 408.2009309152. The cubic root of 166628 is about 55.0278646684.

The spelling of 166628 in words is "one hundred sixty-six thousand, six hundred twenty-eight".