689647 has 8 divisors (see below), whose sum is σ = 798336. Its totient is φ = 583512.

The previous prime is 689641. The next prime is 689693. The reversal of 689647 is 746986.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689647 is a prime.

It is a super-2 number, since 2×689647² = 951225969218, which contains 22 as substring.

689647 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13 + ... + 1174.

It is an arithmetic number, because the mean of its divisors is an integer number (99792).

2⁶⁸⁹⁶⁴⁷ is an apocalyptic number.

689647 is a deficient number, since it is larger than the sum of its proper divisors (108689).

689647 is a wasteful number, since it uses less digits than its factorization.

689647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277.

The product of its digits is 72576, while the sum is 40.

The square root of 689647 is about 830.4498780781. The cubic root of 689647 is about 88.3504875509.

The spelling of 689647 in words is "six hundred eighty-nine thousand, six hundred forty-seven".