687922 has 8 divisors (see below), whose sum is σ = 1092636. Its totient is φ = 323712.

The previous prime is 687917. The next prime is 687923. The reversal of 687922 is 229786.

It can be written as a sum of positive squares in 2 ways, for example, as 670761 + 17161 = 819^2 + 131^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 20233 = 687922 / (6 + 8 + 7 + 9 + 2 + 2).

It is not an unprimeable number, because it can be changed into a prime (687923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10083 + ... + 10150.

2⁶⁸⁷⁹²² is an apocalyptic number.

687922 is a deficient number, since it is larger than the sum of its proper divisors (404714).

687922 is a wasteful number, since it uses less digits than its factorization.

687922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20252.

The product of its digits is 12096, while the sum is 34.

The square root of 687922 is about 829.4106341252. The cubic root of 687922 is about 88.2767629562.

The spelling of 687922 in words is "six hundred eighty-seven thousand, nine hundred twenty-two".