278679 has 4 divisors (see below), whose sum is σ = 371576. Its totient is φ = 185784.

The previous prime is 278671. The next prime is 278687. The reversal of 278679 is 976872.

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

It is an interprime number because it is at equal distance from previous prime (278671) and next prime (278687).

It is not a de Polignac number, because 278679 - 2³ = 278671 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278671) 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 3 ways as a sum of consecutive naturals, for example, 46444 + ... + 46449.

It is an arithmetic number, because the mean of its divisors is an integer number (92894).

2²⁷⁸⁶⁷⁹ is an apocalyptic number.

278679 is a deficient number, since it is larger than the sum of its proper divisors (92897).

278679 is an equidigital number, since it uses as much as digits as its factorization.

278679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92896.

The product of its digits is 42336, while the sum is 39.

The square root of 278679 is about 527.9005588177. The cubic root of 278679 is about 65.3182811592.

The spelling of 278679 in words is "two hundred seventy-eight thousand, six hundred seventy-nine".