278364 has 12 divisors (see below), whose sum is σ = 649544. Its totient is φ = 92784.

The previous prime is 278363. The next prime is 278387. The reversal of 278364 is 463872.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11587 + ... + 11610.

2²⁷⁸³⁶⁴ is an apocalyptic number.

It is an amenable number.

278364 is an abundant number, since it is smaller than the sum of its proper divisors (371180).

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

278364 is a wasteful number, since it uses less digits than its factorization.

278364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23204 (or 23202 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 278364 is about 527.6021228160. The cubic root of 278364 is about 65.2936614166.

The spelling of 278364 in words is "two hundred seventy-eight thousand, three hundred sixty-four".