687045 has 16 divisors (see below), whose sum is σ = 1109952. Its totient is φ = 362880.

The previous prime is 687041. The next prime is 687061. The reversal of 687045 is 540786.

It is a happy number.

It is not a de Polignac number, because 687045 - 2² = 687041 is a prime.

687045 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2305 + ... + 2585.

It is an arithmetic number, because the mean of its divisors is an integer number (69372).

2⁶⁸⁷⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

687045 is a deficient number, since it is larger than the sum of its proper divisors (422907).

687045 is a wasteful number, since it uses less digits than its factorization.

687045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 687045 is about 828.8817768536. The cubic root of 687045 is about 88.2392336803.

The spelling of 687045 in words is "six hundred eighty-seven thousand, forty-five".