278742 has 8 divisors (see below), whose sum is σ = 557496. Its totient is φ = 92912.

The previous prime is 278741. The next prime is 278743. The reversal of 278742 is 247872.

It is an interprime number because it is at equal distance from previous prime (278741) and next prime (278743).

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

278742 is an admirable 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 (278741) 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, 23223 + ... + 23234.

It is an arithmetic number, because the mean of its divisors is an integer number (69687).

2²⁷⁸⁷⁴² is an apocalyptic number.

278742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

278742 is a wasteful number, since it uses less digits than its factorization.

278742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46462.

The product of its digits is 6272, while the sum is 30.

The square root of 278742 is about 527.9602257746. The cubic root of 278742 is about 65.3232028811.

The spelling of 278742 in words is "two hundred seventy-eight thousand, seven hundred forty-two".