628668 has 24 divisors (see below), whose sum is σ = 1630160. Its totient is φ = 209520.

The previous prime is 628651. The next prime is 628673. The reversal of 628668 is 866826.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

628668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2803 + ... + 3018.

2⁶²⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

628668 is an abundant number, since it is smaller than the sum of its proper divisors (1001492).

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

628668 is a wasteful number, since it uses less digits than its factorization.

628668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5834 (or 5826 counting only the distinct ones).

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

The square root of 628668 is about 792.8858682055. The cubic root of 628668 is about 85.6657296416.

It can be divided in two parts, 628 and 668, that added together give a 4-th power (1296 = 6⁴).

The spelling of 628668 in words is "six hundred twenty-eight thousand, six hundred sixty-eight".