679720 has 16 divisors (see below), whose sum is σ = 1529460. Its totient is φ = 271872.

The previous prime is 679709. The next prime is 679733. The reversal of 679720 is 27976.

It is a happy number.

679720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 630436 + 49284 = 794^2 + 222^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8457 + ... + 8536.

2⁶⁷⁹⁷²⁰ is an apocalyptic number.

It is an amenable number.

679720 is an abundant number, since it is smaller than the sum of its proper divisors (849740).

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

679720 is a wasteful number, since it uses less digits than its factorization.

679720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17004 (or 17000 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 679720 is about 824.4513327056. The cubic root of 679720 is about 87.9245220576.

The spelling of 679720 in words is "six hundred seventy-nine thousand, seven hundred twenty".