628684 has 12 divisors (see below), whose sum is σ = 1257424. Its totient is φ = 269424.

The previous prime is 628681. The next prime is 628687. The reversal of 628684 is 486826.

It is an interprime number because it is at equal distance from previous prime (628681) and next prime (628687).

628684 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (628681) 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, 11199 + ... + 11254.

2⁶²⁸⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

628684 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

628684 is a wasteful number, since it uses less digits than its factorization.

628684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22464 (or 22462 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 628684 is about 792.8959578658. The cubic root of 628684 is about 85.6664563846. Note that the first 3 decimals are identical.

The spelling of 628684 in words is "six hundred twenty-eight thousand, six hundred eighty-four".