691960 has 16 divisors (see below), whose sum is σ = 1557000. Its totient is φ = 276768.

The previous prime is 691949. The next prime is 691973. The reversal of 691960 is 69196.

691960 = T₃₆₇ + T₃₆₈ + ... + T₃₇₆.

It is a congruent number.

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 8610 + ... + 8689.

2⁶⁹¹⁹⁶⁰ is an apocalyptic number.

It is an amenable number.

691960 is an abundant number, since it is smaller than the sum of its proper divisors (865040).

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

691960 is a wasteful number, since it uses less digits than its factorization.

691960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17310 (or 17306 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 691960 is about 831.8413310241. The cubic root of 691960 is about 88.4491499301.

The spelling of 691960 in words is "six hundred ninety-one thousand, nine hundred sixty".