679978 has 8 divisors (see below), whose sum is σ = 1098468. Its totient is φ = 313824.

The previous prime is 679969. The next prime is 679981. The reversal of 679978 is 879976.

It can be written as a sum of positive squares in 2 ways, for example, as 573049 + 106929 = 757^2 + 327^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13051 + ... + 13102.

2⁶⁷⁹⁹⁷⁸ is an apocalyptic number.

679978 is a deficient number, since it is larger than the sum of its proper divisors (418490).

679978 is a wasteful number, since it uses less digits than its factorization.

679978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26168.

The product of its digits is 190512, while the sum is 46.

The square root of 679978 is about 824.6077855563. The cubic root of 679978 is about 87.9356450971.

The spelling of 679978 in words is "six hundred seventy-nine thousand, nine hundred seventy-eight".