687472 has 10 divisors (see below), whose sum is σ = 1332008. Its totient is φ = 343728.

The previous prime is 687461. The next prime is 687473. The reversal of 687472 is 274786.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687473) 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 as a sum of consecutive naturals, namely, 21468 + ... + 21499.

2⁶⁸⁷⁴⁷² is an apocalyptic number.

It is an amenable number.

687472 is a deficient number, since it is larger than the sum of its proper divisors (644536).

687472 is a wasteful number, since it uses less digits than its factorization.

687472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42975 (or 42969 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 687472 is about 829.1393127816. The cubic root of 687472 is about 88.2575101881.

Subtracting from 687472 its reverse (274786), we obtain a triangular number (412686 = T₉₀₈).

It can be divided in two parts, 6 and 87472, that added together give a palindrome (87478).

The spelling of 687472 in words is "six hundred eighty-seven thousand, four hundred seventy-two".