691104 has 48 divisors (see below), whose sum is σ = 1899072. Its totient is φ = 219648.

The previous prime is 691079. The next prime is 691109. The reversal of 691104 is 401196.

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 691104.

It is not an unprimeable number, because it can be changed into a prime (691109) by changing a digit.

691104 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2052 + ... + 2364.

It is an arithmetic number, because the mean of its divisors is an integer number (39564).

2⁶⁹¹¹⁰⁴ 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 691104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949536).

691104 is an abundant number, since it is smaller than the sum of its proper divisors (1207968).

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

691104 is a wasteful number, since it uses less digits than its factorization.

691104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 691104 is about 831.3266506013. The cubic root of 691104 is about 88.4126624095.

It can be divided in two parts, 69 and 1104, that multiplied together give a square (76176 = 276²).

The spelling of 691104 in words is "six hundred ninety-one thousand, one hundred four".