687020 has 12 divisors (see below), whose sum is σ = 1442784. Its totient is φ = 274800.

The previous prime is 687019. The next prime is 687023. The reversal of 687020 is 20786.

687020 is nontrivially palindromic in base 7.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687020.

It is not an unprimeable number, because it can be changed into a prime (687023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17156 + ... + 17195.

It is an arithmetic number, because the mean of its divisors is an integer number (120232).

2⁶⁸⁷⁰²⁰ is an apocalyptic number.

It is an amenable number.

687020 is an abundant number, since it is smaller than the sum of its proper divisors (755764).

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

687020 is a wasteful number, since it uses less digits than its factorization.

687020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34360 (or 34358 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 687020 is about 828.8666961581. The cubic root of 687020 is about 88.2381633925.

The spelling of 687020 in words is "six hundred eighty-seven thousand, twenty".