278604 has 36 divisors (see below), whose sum is σ = 720720. Its totient is φ = 90720.

The previous prime is 278591. The next prime is 278609. The reversal of 278604 is 406872.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (278609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2502 + ... + 2610.

It is an arithmetic number, because the mean of its divisors is an integer number (20020).

2²⁷⁸⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360360).

278604 is an abundant number, since it is smaller than the sum of its proper divisors (442116).

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

278604 is a wasteful number, since it uses less digits than its factorization.

278604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 278604 is about 527.8295179317. The cubic root of 278604 is about 65.3124209991.

Adding to 278604 its sum of digits (27), we get a triangular number (278631 = T₇₄₆).

It can be divided in two parts, 2 and 78604, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 278604 in words is "two hundred seventy-eight thousand, six hundred four".