691704 has 48 divisors (see below), whose sum is σ = 2020200. Its totient is φ = 212544.

The previous prime is 691697. The next prime is 691709. The reversal of 691704 is 407196.

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 691704.

It is not an unprimeable number, because it can be changed into a prime (691709) by changing a digit.

691704 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 11 ways as a sum of consecutive naturals, for example, 567 + ... + 1305.

2⁶⁹¹⁷⁰⁴ 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 691704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010100).

691704 is an abundant number, since it is smaller than the sum of its proper divisors (1328496).

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

691704 is a wasteful number, since it uses less digits than its factorization.

691704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 691704 is about 831.6874412903. The cubic root of 691704 is about 88.4382409299.

The spelling of 691704 in words is "six hundred ninety-one thousand, seven hundred four".