691676 has 18 divisors (see below), whose sum is σ = 1280160. Its totient is φ = 326952.

The previous prime is 691661. The next prime is 691681. The reversal of 691676 is 676196.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691676.

It is an unprimeable number.

691676 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, 1205 + ... + 1683.

It is an arithmetic number, because the mean of its divisors is an integer number (71120).

2⁶⁹¹⁶⁷⁶ is an apocalyptic number.

It is an amenable number.

691676 is a deficient number, since it is larger than the sum of its proper divisors (588484).

691676 is a wasteful number, since it uses less digits than its factorization.

691676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 500 counting only the distinct ones).

The product of its digits is 13608, while the sum is 35.

The square root of 691676 is about 831.6706078731. The cubic root of 691676 is about 88.4370475947.

The spelling of 691676 in words is "six hundred ninety-one thousand, six hundred seventy-six".