687144 has 16 divisors (see below), whose sum is σ = 1717920. Its totient is φ = 229040.

The previous prime is 687139. The next prime is 687151. The reversal of 687144 is 441786.

It is a super-3 number, since 3×687144³ = 973339909043645952, which contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14292 + ... + 14339.

It is an arithmetic number, because the mean of its divisors is an integer number (107370).

2⁶⁸⁷¹⁴⁴ is an apocalyptic number.

It is an amenable number.

687144 is an abundant number, since it is smaller than the sum of its proper divisors (1030776).

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

687144 is a wasteful number, since it uses less digits than its factorization.

687144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28640 (or 28636 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 687144 is about 828.9414937135. The cubic root of 687144 is about 88.2434717649.

The spelling of 687144 in words is "six hundred eighty-seven thousand, one hundred forty-four".