689964 has 24 divisors (see below), whose sum is σ = 1756608. Its totient is φ = 209040.

The previous prime is 689963. The next prime is 689981. The reversal of 689964 is 469986.

It is not an unprimeable number, because it can be changed into a prime (689963) 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, 2482 + ... + 2745.

It is an arithmetic number, because the mean of its divisors is an integer number (73192).

2⁶⁸⁹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

689964 is an abundant number, since it is smaller than the sum of its proper divisors (1066644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689964 is a wasteful number, since it uses less digits than its factorization.

689964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5245 (or 5243 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 689964 is about 830.6407165556. The cubic root of 689964 is about 88.3640224050.

It can be divided in two parts, 689 and 964, that added together give a triangular number (1653 = T₅₇).

The spelling of 689964 in words is "six hundred eighty-nine thousand, nine hundred sixty-four".