689990 has 16 divisors (see below), whose sum is σ = 1419552. Its totient is φ = 236544.

The previous prime is 689987. The next prime is 690037. The reversal of 689990 is 99986.

It is a Curzon number.

It is a zygodrome in base 6.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4859 + ... + 4998.

It is an arithmetic number, because the mean of its divisors is an integer number (88722).

2⁶⁸⁹⁹⁹⁰ is an apocalyptic number.

689990 is an abundant number, since it is smaller than the sum of its proper divisors (729562).

It is a weird number, because it is abundant, but not a pseudoperfect number.

689990 is a wasteful number, since it uses less digits than its factorization.

689990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9871.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 689990 is about 830.6563669773. The cubic root of 689990 is about 88.3651323352.

The spelling of 689990 in words is "six hundred eighty-nine thousand, nine hundred ninety".