691296 has 48 divisors (see below), whose sum is σ = 1915200. Its totient is φ = 217728.

The previous prime is 691289. The next prime is 691297. The reversal of 691296 is 692196.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

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 691296.

It is not an unprimeable number, because it can be changed into a prime (691297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1635 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (39900).

2⁶⁹¹²⁹⁶ 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 691296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (957600).

691296 is an abundant number, since it is smaller than the sum of its proper divisors (1223904).

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

691296 is a wasteful number, since it uses less digits than its factorization.

691296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 403 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 691296 is about 831.4421206554. The cubic root of 691296 is about 88.4208491462.

Subtracting 691296 from its reverse (692196), we obtain a square (900 = 30²).

The spelling of 691296 in words is "six hundred ninety-one thousand, two hundred ninety-six".