689677 has 6 divisors (see below), whose sum is σ = 707982. Its totient is φ = 671832.

The previous prime is 689641. The next prime is 689693. The reversal of 689677 is 776986.

It can be written as a sum of positive squares in only one way, i.e., 599076 + 90601 = 774^2 + 301^2 .

It is a de Polignac number, because none of the positive numbers 2^k-689677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a d-powerful number, because it can be written as 6² + 8⁵ + 6⁵ + 9⁶ + 7 + 7⁶ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689077) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1663 + ... + 2035.

It is an arithmetic number, because the mean of its divisors is an integer number (117997).

2⁶⁸⁹⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

689677 is a deficient number, since it is larger than the sum of its proper divisors (18305).

689677 is an equidigital number, since it uses as much as digits as its factorization.

689677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 416 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 689677 is about 830.4679403806. The cubic root of 689677 is about 88.3517686296.

The spelling of 689677 in words is "six hundred eighty-nine thousand, six hundred seventy-seven".