691008 has 56 divisors (see below), whose sum is σ = 1889760. Its totient is φ = 222720.

The previous prime is 691001. The next prime is 691037. The reversal of 691008 is 800196.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 691008.

It is not an unprimeable number, because it can be changed into a prime (691001) 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, 11298 + ... + 11358.

2⁶⁹¹⁰⁰⁸ 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 691008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (944880).

691008 is an abundant number, since it is smaller than the sum of its proper divisors (1198752).

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

691008 is a wasteful number, since it uses less digits than its factorization.

691008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 691008 is about 831.2689095594. The cubic root of 691008 is about 88.4085684726.

The spelling of 691008 in words is "six hundred ninety-one thousand, eight".