687402 has 12 divisors (see below), whose sum is σ = 1489410. Its totient is φ = 229128.

The previous prime is 687397. The next prime is 687403. The reversal of 687402 is 204786.

It can be written as a sum of positive squares in only one way, i.e., 670761 + 16641 = 819^2 + 129^2 .

It is not an unprimeable number, because it can be changed into a prime (687403) by changing a digit.

687402 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 19077 + ... + 19112.

2⁶⁸⁷⁴⁰² is an apocalyptic number.

687402 is an abundant number, since it is smaller than the sum of its proper divisors (802008).

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

687402 is a wasteful number, since it uses less digits than its factorization.

687402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38197 (or 38194 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 687402 is about 829.0970992592. The cubic root of 687402 is about 88.2545145580.

It can be divided in two parts, 687 and 402, that added together give a square (1089 = 33²).

The spelling of 687402 in words is "six hundred eighty-seven thousand, four hundred two".