278487 has 24 divisors (see below), whose sum is σ = 458640. Its totient is φ = 161280.

The previous prime is 278479. The next prime is 278489. The reversal of 278487 is 784872.

It is not a de Polignac number, because 278487 - 2³ = 278479 is a prime.

It is a plaindrome in base 15.

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 278487.

It is not an unprimeable number, because it can be changed into a prime (278489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2823 + ... + 2919.

It is an arithmetic number, because the mean of its divisors is an integer number (19110).

2²⁷⁸⁴⁸⁷ is an apocalyptic number.

278487 is a deficient number, since it is larger than the sum of its proper divisors (180153).

278487 is a wasteful number, since it uses less digits than its factorization.

278487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 140 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 278487 is about 527.7186750533. The cubic root of 278487 is about 65.3032770490.

The spelling of 278487 in words is "two hundred seventy-eight thousand, four hundred eighty-seven".