278583 has 4 divisors (see below), whose sum is σ = 371448. Its totient is φ = 185720.

The previous prime is 278581. The next prime is 278591. The reversal of 278583 is 385872.

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 278583 - 2¹ = 278581 is a prime.

It is a d-powerful number, because it can be written as 2¹⁵ + 7 + 5⁵ + 8⁵ + 8⁵ + 3¹¹ .

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46428 + ... + 46433.

It is an arithmetic number, because the mean of its divisors is an integer number (92862).

2²⁷⁸⁵⁸³ is an apocalyptic number.

278583 is a deficient number, since it is larger than the sum of its proper divisors (92865).

278583 is an equidigital number, since it uses as much as digits as its factorization.

278583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92864.

The product of its digits is 13440, while the sum is 33.

The square root of 278583 is about 527.8096247701. The cubic root of 278583 is about 65.3107799658.

It can be divided in two parts, 278 and 583, that added together give a triangular number (861 = T₄₁).

The spelling of 278583 in words is "two hundred seventy-eight thousand, five hundred eighty-three".