687422 has 16 divisors (see below), whose sum is σ = 1078272. Its totient is φ = 328440.

The previous prime is 687413. The next prime is 687431. The reversal of 687422 is 224786.

It is an interprime number because it is at equal distance from previous prime (687413) and next prime (687431).

It is a congruent number.

It is an unprimeable number.

687422 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6623 + ... + 6725.

It is an arithmetic number, because the mean of its divisors is an integer number (67392).

2⁶⁸⁷⁴²² is an apocalyptic number.

687422 is a deficient number, since it is larger than the sum of its proper divisors (390850).

687422 is a wasteful number, since it uses less digits than its factorization.

687422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223.

The product of its digits is 5376, while the sum is 29.

The square root of 687422 is about 829.1091604849. The cubic root of 687422 is about 88.2553704730.

The spelling of 687422 in words is "six hundred eighty-seven thousand, four hundred twenty-two".