278606 has 4 divisors (see below), whose sum is σ = 417912. Its totient is φ = 139302.

The previous prime is 278591. The next prime is 278609. The reversal of 278606 is 606872.

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

It is a congruent number.

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

278606 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69650 + ... + 69653.

It is an arithmetic number, because the mean of its divisors is an integer number (104478).

2²⁷⁸⁶⁰⁶ is an apocalyptic number.

278606 is a deficient number, since it is larger than the sum of its proper divisors (139306).

278606 is a wasteful number, since it uses less digits than its factorization.

278606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139305.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 278606 is about 527.8314124794. The cubic root of 278606 is about 65.3125772837.

The spelling of 278606 in words is "two hundred seventy-eight thousand, six hundred six".