691344 has 30 divisors (see below), whose sum is σ = 1935206. Its totient is φ = 230400.

The previous prime is 691343. The next prime is 691349. The reversal of 691344 is 443196.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 82944 = 780^2 + 288^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691344.

It is not an unprimeable number, because it can be changed into a prime (691343) 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 5 ways as a sum of consecutive naturals, for example, 2257 + ... + 2544.

2⁶⁹¹³⁴⁴ is an apocalyptic number.

It is an amenable number.

691344 is an abundant number, since it is smaller than the sum of its proper divisors (1243862).

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

691344 is a wasteful number, since it uses less digits than its factorization.

691344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4815 (or 4806 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 691344 is about 831.4709856634. The cubic root of 691344 is about 88.4228955935.

It can be divided in two parts, 691 and 344, that added together give a triangular number (1035 = T₄₅).

The spelling of 691344 in words is "six hundred ninety-one thousand, three hundred forty-four".