689820 has 24 divisors (see below), whose sum is σ = 1931664. Its totient is φ = 183936.

The previous prime is 689807. The next prime is 689827. The reversal of 689820 is 28986.

689820 is nontrivially palindromic in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689827) 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, 5689 + ... + 5808.

It is an arithmetic number, because the mean of its divisors is an integer number (80486).

2⁶⁸⁹⁸²⁰ is an apocalyptic number.

689820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

689820 is an abundant number, since it is smaller than the sum of its proper divisors (1241844).

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

689820 is a wasteful number, since it uses less digits than its factorization.

689820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11509 (or 11507 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 689820 is about 830.5540319570. The cubic root of 689820 is about 88.3578745941.

The spelling of 689820 in words is "six hundred eighty-nine thousand, eight hundred twenty".