679980 has 48 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 155328.

The previous prime is 679969. The next prime is 679981. The reversal of 679980 is 89976.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390 + ... + 1229.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁶⁷⁹⁹⁸⁰ is an apocalyptic number.

679980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

679980 is an abundant number, since it is smaller than the sum of its proper divisors (1497300).

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

679980 is a wasteful number, since it uses less digits than its factorization.

679980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 679980 is about 824.6089982531. The cubic root of 679980 is about 87.9357313112.

The spelling of 679980 in words is "six hundred seventy-nine thousand, nine hundred eighty".