278087 has 2 divisors, whose sum is σ = 278088. Its totient is φ = 278086.

The previous prime is 278071. The next prime is 278111. The reversal of 278087 is 780872.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278087 - 2⁴ = 278071 is a prime.

It is a Chen prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278087.

It is not a weakly prime, because it can be changed into another prime (278017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139043 + 139044.

It is an arithmetic number, because the mean of its divisors is an integer number (139044).

2²⁷⁸⁰⁸⁷ is an apocalyptic number.

278087 is a deficient number, since it is larger than the sum of its proper divisors (1).

278087 is an equidigital number, since it uses as much as digits as its factorization.

278087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 278087 is about 527.3395490573. The cubic root of 278087 is about 65.2719963225.

It can be divided in two parts, 2780 and 87, that multiplied together give a triangular number (241860 = T₆₉₅).

The spelling of 278087 in words is "two hundred seventy-eight thousand, eighty-seven".