680390 has 16 divisors (see below), whose sum is σ = 1289520. Its totient is φ = 257760.

The previous prime is 680387. The next prime is 680399. The reversal of 680390 is 93086.

680390 = T₆₉ + T₇₀ + ... + T₁₆₃.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680399) 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, 1601 + ... + 1980.

It is an arithmetic number, because the mean of its divisors is an integer number (80595).

2⁶⁸⁰³⁹⁰ is an apocalyptic number.

680390 is a deficient number, since it is larger than the sum of its proper divisors (609130).

680390 is a wasteful number, since it uses less digits than its factorization.

680390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 680390 is about 824.8575634617. The cubic root of 680390 is about 87.9534016378.

The spelling of 680390 in words is "six hundred eighty thousand, three hundred ninety".