687498 has 16 divisors (see below), whose sum is σ = 1571520. Its totient is φ = 196416.

The previous prime is 687481. The next prime is 687499. The reversal of 687498 is 894786.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 16369 = 687498 / (6 + 8 + 7 + 4 + 9 + 8).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687498.

It is not an unprimeable number, because it can be changed into a prime (687499) by changing a digit.

687498 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 7 ways as a sum of consecutive naturals, for example, 8143 + ... + 8226.

It is an arithmetic number, because the mean of its divisors is an integer number (98220).

2⁶⁸⁷⁴⁹⁸ is an apocalyptic number.

687498 is an abundant number, since it is smaller than the sum of its proper divisors (884022).

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

687498 is a wasteful number, since it uses less digits than its factorization.

687498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16381.

The product of its digits is 96768, while the sum is 42.

The square root of 687498 is about 829.1549915426. The cubic root of 687498 is about 88.2586227989.

The spelling of 687498 in words is "six hundred eighty-seven thousand, four hundred ninety-eight".