278771 has 4 divisors (see below), whose sum is σ = 281352. Its totient is φ = 276192.

The previous prime is 278767. The next prime is 278801. The reversal of 278771 is 177872.

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

It is a cyclic number.

It is not a de Polignac number, because 278771 - 2² = 278767 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278771.

It is not an unprimeable number, because it can be changed into a prime (278701) 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, 1121 + ... + 1346.

It is an arithmetic number, because the mean of its divisors is an integer number (70338).

2²⁷⁸⁷⁷¹ is an apocalyptic number.

278771 is a deficient number, since it is larger than the sum of its proper divisors (2581).

278771 is a wasteful number, since it uses less digits than its factorization.

278771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580.

The product of its digits is 5488, while the sum is 32.

The square root of 278771 is about 527.9876892504. The cubic root of 278771 is about 65.3254681864.

The spelling of 278771 in words is "two hundred seventy-eight thousand, seven hundred seventy-one".