687748 has 6 divisors (see below), whose sum is σ = 1203566. Its totient is φ = 343872.

The previous prime is 687737. The next prime is 687749. The reversal of 687748 is 847786.

687748 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 521284 + 166464 = 722^2 + 408^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 687748.

It is not an unprimeable number, because it can be changed into a prime (687749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85965 + ... + 85972.

2⁶⁸⁷⁷⁴⁸ is an apocalyptic number.

It is an amenable number.

687748 is a deficient number, since it is larger than the sum of its proper divisors (515818).

687748 is a wasteful number, since it uses less digits than its factorization.

687748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171941 (or 171939 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 687748 is about 829.3057337315. The cubic root of 687748 is about 88.2693195484.

The spelling of 687748 in words is "six hundred eighty-seven thousand, seven hundred forty-eight".