278671 has 2 divisors, whose sum is σ = 278672. Its totient is φ = 278670.

The previous prime is 278651. The next prime is 278687. The reversal of 278671 is 176872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278671 - 2⁵ = 278639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278611) 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 as a sum of consecutive naturals, namely, 139335 + 139336.

It is an arithmetic number, because the mean of its divisors is an integer number (139336).

2²⁷⁸⁶⁷¹ is an apocalyptic number.

278671 is a deficient number, since it is larger than the sum of its proper divisors (1).

278671 is an equidigital number, since it uses as much as digits as its factorization.

278671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 278671 is about 527.8929815787. The cubic root of 278671 is about 65.3176561255.

It can be divided in two parts, 278 and 671, that added together give a palindrome (949).

The spelling of 278671 in words is "two hundred seventy-eight thousand, six hundred seventy-one".