687436 has 12 divisors (see below), whose sum is σ = 1217160. Its totient is φ = 339680.

The previous prime is 687433. The next prime is 687437. The reversal of 687436 is 634786.

It is a d-powerful number, because it can be written as 6⁶ + 8³ + 4⁸ + 7⁶ + 3¹¹ + 6⁷ .

It is not an unprimeable number, because it can be changed into a prime (687431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (101430).

2⁶⁸⁷⁴³⁶ is an apocalyptic number.

It is an amenable number.

687436 is a deficient number, since it is larger than the sum of its proper divisors (529724).

687436 is a wasteful number, since it uses less digits than its factorization.

687436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024 (or 2022 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 687436 is about 829.1176032385. The cubic root of 687436 is about 88.2559696037.

Subtracting from 687436 its reverse (634786), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 687436 in words is "six hundred eighty-seven thousand, four hundred thirty-six".