628686 has 24 divisors (see below), whose sum is σ = 1389960. Its totient is φ = 205296.

The previous prime is 628681. The next prime is 628687. The reversal of 628686 is 686826.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 628686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 625 + ... + 1283.

It is an arithmetic number, because the mean of its divisors is an integer number (57915).

2⁶²⁸⁶⁸⁶ is an apocalyptic number.

628686 is an abundant number, since it is smaller than the sum of its proper divisors (761274).

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

628686 is a wasteful number, since it uses less digits than its factorization.

628686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 717 counting only the distinct ones).

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

The square root of 628686 is about 792.8972190644. The cubic root of 628686 is about 85.6665472266. Note that the first 3 decimals are identical.

The spelling of 628686 in words is "six hundred twenty-eight thousand, six hundred eighty-six".