278583379 has 4 divisors (see below), whose sum is σ = 281288176. Its totient is φ = 275878584.

The previous prime is 278583359. The next prime is 278583407. The reversal of 278583379 is 973385872.

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 278583379 - 2⁹ = 278582867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278583359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1352244 + ... + 1352449.

It is an arithmetic number, because the mean of its divisors is an integer number (70322044).

Almost surely, 2^278583379 is an apocalyptic number.

278583379 is a deficient number, since it is larger than the sum of its proper divisors (2704797).

278583379 is a wasteful number, since it uses less digits than its factorization.

278583379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704796.

The product of its digits is 2540160, while the sum is 52.

The square root of 278583379 is about 16690.8172058770. The cubic root of 278583379 is about 653.1080958332.

The spelling of 278583379 in words is "two hundred seventy-eight million, five hundred eighty-three thousand, three hundred seventy-nine".