689777 has 8 divisors (see below), whose sum is σ = 763680. Its totient is φ = 617760.

The previous prime is 689771. The next prime is 689779. The reversal of 689777 is 777986.

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

It is not a de Polignac number, because 689777 - 2⁴ = 689761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689771) 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, 374 + ... + 1232.

It is an arithmetic number, because the mean of its divisors is an integer number (95460).

2⁶⁸⁹⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

689777 is a deficient number, since it is larger than the sum of its proper divisors (73903).

689777 is a wasteful number, since it uses less digits than its factorization.

689777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943.

The product of its digits is 148176, while the sum is 44.

The square root of 689777 is about 830.5281452185. The cubic root of 689777 is about 88.3560386236.

Subtracting 689777 from its reverse (777986), we obtain a square (88209 = 297²).

The spelling of 689777 in words is "six hundred eighty-nine thousand, seven hundred seventy-seven".