628866 has 72 divisors (see below), whose sum is σ = 1707264. Its totient is φ = 166320.

The previous prime is 628861. The next prime is 628877. The reversal of 628866 is 668826.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 628866.

It is not an unprimeable number, because it can be changed into a prime (628861) by changing a digit.

628866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20271 + ... + 20301.

It is an arithmetic number, because the mean of its divisors is an integer number (23712).

2⁶²⁸⁸⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 628866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (853632).

628866 is an abundant number, since it is smaller than the sum of its proper divisors (1078398).

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

628866 is a wasteful number, since it uses less digits than its factorization.

628866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 66 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 628866 is about 793.0107187170. The cubic root of 628866 is about 85.6747222175.

The spelling of 628866 in words is "six hundred twenty-eight thousand, eight hundred sixty-six".