687242 has 24 divisors (see below), whose sum is σ = 1160460. Its totient is φ = 304640.

The previous prime is 687233. The next prime is 687277. The reversal of 687242 is 242786.

687242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 829²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 361201 + 326041 = 601^2 + 571^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687242.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16742 + ... + 16782.

2⁶⁸⁷²⁴² is an apocalyptic number.

687242 is a deficient number, since it is larger than the sum of its proper divisors (473218).

687242 is a wasteful number, since it uses less digits than its factorization.

687242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 89 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 687242 is about 829.0006031361. Note that the first 3 decimals coincide. The cubic root of 687242 is about 88.2476666397.

It can be divided in two parts, 687 and 242, that added together give a palindrome (929).

The spelling of 687242 in words is "six hundred eighty-seven thousand, two hundred forty-two".