691662 has 16 divisors (see below), whose sum is σ = 1464912. Its totient is φ = 216960.

The previous prime is 691661. The next prime is 691681. The reversal of 691662 is 266196.

It is an Ulam number.

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 691662.

It is not an unprimeable number, because it can be changed into a prime (691661) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3289 + ... + 3492.

It is an arithmetic number, because the mean of its divisors is an integer number (91557).

2⁶⁹¹⁶⁶² is an apocalyptic number.

691662 is an abundant number, since it is smaller than the sum of its proper divisors (773250).

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

691662 is a wasteful number, since it uses less digits than its factorization.

691662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6803.

The product of its digits is 3888, while the sum is 30.

The square root of 691662 is about 831.6621910367. The cubic root of 691662 is about 88.4364509151.

The spelling of 691662 in words is "six hundred ninety-one thousand, six hundred sixty-two".