278906 has 8 divisors (see below), whose sum is σ = 429780. Its totient is φ = 135648.

The previous prime is 278903. The next prime is 278909. The reversal of 278906 is 609872.

It is an interprime number because it is at equal distance from previous prime (278903) and next prime (278909).

It can be written as a sum of positive squares in 2 ways, for example, as 235225 + 43681 = 485^2 + 209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (278903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1811 + ... + 1958.

2²⁷⁸⁹⁰⁶ is an apocalyptic number.

278906 is a deficient number, since it is larger than the sum of its proper divisors (150874).

278906 is a wasteful number, since it uses less digits than its factorization.

278906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 278906 is about 528.1155176664. The cubic root of 278906 is about 65.3360115057.

The spelling of 278906 in words is "two hundred seventy-eight thousand, nine hundred six".