278680 has 16 divisors (see below), whose sum is σ = 627120. Its totient is φ = 111456.

The previous prime is 278671. The next prime is 278687. The reversal of 278680 is 86872.

It is a plaindrome in base 13 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3444 + ... + 3523.

It is an arithmetic number, because the mean of its divisors is an integer number (39195).

2²⁷⁸⁶⁸⁰ is an apocalyptic number.

278680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278680 is an abundant number, since it is smaller than the sum of its proper divisors (348440).

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

278680 is a wasteful number, since it uses less digits than its factorization.

278680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6978 (or 6974 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 278680 is about 527.9015059649. The cubic root of 278680 is about 65.3183592875.

The spelling of 278680 in words is "two hundred seventy-eight thousand, six hundred eighty".