691964 has 24 divisors (see below), whose sum is σ = 1491168. Its totient is φ = 273600.

The previous prime is 691949. The next prime is 691973. The reversal of 691964 is 469196.

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 691964.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 587 + ... + 1314.

It is an arithmetic number, because the mean of its divisors is an integer number (62132).

2⁶⁹¹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

691964 is an abundant number, since it is smaller than the sum of its proper divisors (799204).

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

691964 is a wasteful number, since it uses less digits than its factorization.

691964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925 (or 1923 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 691964 is about 831.8437353253. The cubic root of 691964 is about 88.4493203619.

The spelling of 691964 in words is "six hundred ninety-one thousand, nine hundred sixty-four".