691744 has 12 divisors (see below), whose sum is σ = 1361934. Its totient is φ = 345856.

The previous prime is 691739. The next prime is 691759. The reversal of 691744 is 447196.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 32400 = 812^2 + 180^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10777 + ... + 10840.

2⁶⁹¹⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

691744 is a deficient number, since it is larger than the sum of its proper divisors (670190).

691744 is a wasteful number, since it uses less digits than its factorization.

691744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21627 (or 21619 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 691744 is about 831.7114884381. The cubic root of 691744 is about 88.4399456386.

The spelling of 691744 in words is "six hundred ninety-one thousand, seven hundred forty-four".