687628 has 12 divisors (see below), whose sum is σ = 1215760. Its totient is φ = 340272.

The previous prime is 687623. The next prime is 687637. The reversal of 687628 is 826786.

687628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (687623) by changing a digit.

687628 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 3 ways as a sum of consecutive naturals, for example, 423 + ... + 1246.

2⁶⁸⁷⁶²⁸ is an apocalyptic number.

It is an amenable number.

687628 is a deficient number, since it is larger than the sum of its proper divisors (528132).

687628 is a wasteful number, since it uses less digits than its factorization.

687628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776 (or 1774 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 687628 is about 829.2333809007. The cubic root of 687628 is about 88.2641854322.

The spelling of 687628 in words is "six hundred eighty-seven thousand, six hundred twenty-eight".