691768 has 32 divisors (see below), whose sum is σ = 1618560. Its totient is φ = 269280.

The previous prime is 691763. The next prime is 691787. The reversal of 691768 is 867196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55 + ... + 1177.

It is an arithmetic number, because the mean of its divisors is an integer number (50580).

2⁶⁹¹⁷⁶⁸ 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 691768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809280).

691768 is an abundant number, since it is smaller than the sum of its proper divisors (926792).

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

691768 is a wasteful number, since it uses less digits than its factorization.

691768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147 (or 1143 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 691768 is about 831.7259163931. The cubic root of 691768 is about 88.4409684323.

The spelling of 691768 in words is "six hundred ninety-one thousand, seven hundred sixty-eight".