689667 has 8 divisors (see below), whose sum is σ = 1003200. Its totient is φ = 417960.

The previous prime is 689641. The next prime is 689693. The reversal of 689667 is 766986.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (689641) and next prime (689693).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 689667 - 2⁶ = 689603 is a prime.

689667 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (689167) 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 7 ways as a sum of consecutive naturals, for example, 10417 + ... + 10482.

It is an arithmetic number, because the mean of its divisors is an integer number (125400).

2⁶⁸⁹⁶⁶⁷ is an apocalyptic number.

689667 is a deficient number, since it is larger than the sum of its proper divisors (313533).

689667 is a wasteful number, since it uses less digits than its factorization.

689667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20913.

The product of its digits is 108864, while the sum is 42.

The square root of 689667 is about 830.4619196568. The cubic root of 689667 is about 88.3513416075.

The spelling of 689667 in words is "six hundred eighty-nine thousand, six hundred sixty-seven".