691056 has 30 divisors (see below), whose sum is σ = 1934400. Its totient is φ = 230304.

The previous prime is 691051. The next prime is 691063. The reversal of 691056 is 650196.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2256 + ... + 2543.

It is an arithmetic number, because the mean of its divisors is an integer number (64480).

2⁶⁹¹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

691056 is an abundant number, since it is smaller than the sum of its proper divisors (1243344).

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

691056 is a wasteful number, since it uses less digits than its factorization.

691056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4813 (or 4804 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 691056 is about 831.2977805817. The cubic root of 691056 is about 88.4106154884.

The spelling of 691056 in words is "six hundred ninety-one thousand, fifty-six".