689764 has 6 divisors (see below), whose sum is σ = 1207094. Its totient is φ = 344880.

The previous prime is 689761. The next prime is 689771. The reversal of 689764 is 467986.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 62500 = 792^2 + 250^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (689761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86217 + ... + 86224.

2⁶⁸⁹⁷⁶⁴ is an apocalyptic number.

It is an amenable number.

689764 is a deficient number, since it is larger than the sum of its proper divisors (517330).

689764 is a wasteful number, since it uses less digits than its factorization.

689764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172445 (or 172443 counting only the distinct ones).

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

The square root of 689764 is about 830.5203188363. The cubic root of 689764 is about 88.3554835477.

The spelling of 689764 in words is "six hundred eighty-nine thousand, seven hundred sixty-four".