691068 has 48 divisors (see below), whose sum is σ = 1944320. Its totient is φ = 186624.

The previous prime is 691063. The next prime is 691079. The reversal of 691068 is 860196.

691068 is nontrivially palindromic in base 11.

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 691068.

It is not an unprimeable number, because it can be changed into a prime (691063) by changing a digit.

691068 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 15 ways as a sum of consecutive naturals, for example, 1380 + ... + 1812.

2⁶⁹¹⁰⁶⁸ 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 691068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972160).

691068 is an abundant number, since it is smaller than the sum of its proper divisors (1253252).

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

691068 is a wasteful number, since it uses less digits than its factorization.

691068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 691068 is about 831.3049981806. The cubic root of 691068 is about 88.4111272276.

The spelling of 691068 in words is "six hundred ninety-one thousand, sixty-eight".