687492 has 54 divisors (see below), whose sum is σ = 1898442. Its totient is φ = 209664.

The previous prime is 687481. The next prime is 687499. The reversal of 687492 is 294786.

687492 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 3 ways, for example, as 69696 + 617796 = 264^2 + 786^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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

687492 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6028 + ... + 6140.

2⁶⁸⁷⁴⁹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949221).

687492 is an abundant number, since it is smaller than the sum of its proper divisors (1210950).

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

687492 is a wasteful number, since it uses less digits than its factorization.

687492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 131 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 687492 is about 829.1513733933. The cubic root of 687492 is about 88.2583660450.

The spelling of 687492 in words is "six hundred eighty-seven thousand, four hundred ninety-two".