687738 has 16 divisors (see below), whose sum is σ = 1393056. Its totient is φ = 226320.

The previous prime is 687737. The next prime is 687749. The reversal of 687738 is 837786.

687738 is nontrivially palindromic in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 687696 and 687705.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687738.

It is not an unprimeable number, because it can be changed into a prime (687737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193 + ... + 1188.

It is an arithmetic number, because the mean of its divisors is an integer number (87066).

2⁶⁸⁷⁷³⁸ is an apocalyptic number.

687738 is an abundant number, since it is smaller than the sum of its proper divisors (705318).

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

687738 is a wasteful number, since it uses less digits than its factorization.

687738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469.

The product of its digits is 56448, while the sum is 39.

The square root of 687738 is about 829.2997045701. The cubic root of 687738 is about 88.2688917282.

The spelling of 687738 in words is "six hundred eighty-seven thousand, seven hundred thirty-eight".