678979 has 4 divisors (see below), whose sum is σ = 775984. Its totient is φ = 581976.

The previous prime is 678971. The next prime is 678989. The reversal of 678979 is 979876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678979 - 2³ = 678971 is a prime.

It is a super-2 number, since 2×678979² = 922024964882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48492 + ... + 48505.

It is an arithmetic number, because the mean of its divisors is an integer number (193996).

2⁶⁷⁸⁹⁷⁹ is an apocalyptic number.

678979 is a deficient number, since it is larger than the sum of its proper divisors (97005).

678979 is an equidigital number, since it uses as much as digits as its factorization.

678979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97004.

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

The square root of 678979 is about 824.0018203863. The cubic root of 678979 is about 87.8925599946.

The spelling of 678979 in words is "six hundred seventy-eight thousand, nine hundred seventy-nine".