278602 has 4 divisors (see below), whose sum is σ = 417906. Its totient is φ = 139300.

The previous prime is 278591. The next prime is 278609. The reversal of 278602 is 206872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 175561 + 103041 = 419^2 + 321^2 .

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 as a sum of consecutive naturals, namely, 69649 + ... + 69652.

2²⁷⁸⁶⁰² is an apocalyptic number.

278602 is a deficient number, since it is larger than the sum of its proper divisors (139304).

278602 is a wasteful number, since it uses less digits than its factorization.

278602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139303.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 278602 is about 527.8276233772. The cubic root of 278602 is about 65.3122647138.

The spelling of 278602 in words is "two hundred seventy-eight thousand, six hundred two".