278091 has 18 divisors (see below), whose sum is σ = 446628. Its totient is φ = 165360.

The previous prime is 278087. The next prime is 278111. The reversal of 278091 is 190872.

It is not a de Polignac number, because 278091 - 2² = 278087 is a prime.

278091 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278091.

It is not an unprimeable number, because it can be changed into a prime (278041) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5221 + ... + 5273.

2²⁷⁸⁰⁹¹ is an apocalyptic number.

278091 is a deficient number, since it is larger than the sum of its proper divisors (168537).

278091 is a wasteful number, since it uses less digits than its factorization.

278091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 278091 is about 527.3433416665. The cubic root of 278091 is about 65.2723092782.

It can be divided in two parts, 27 and 8091, that added together give a palindrome (8118).

The spelling of 278091 in words is "two hundred seventy-eight thousand, ninety-one".