278717983 has 4 divisors (see below), whose sum is σ = 278806968. Its totient is φ = 278629000.

The previous prime is 278717981. The next prime is 278718017. The reversal of 278717983 is 389717872.

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 278717983 - 2¹ = 278717981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 278717983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278717981) 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, 39616 + ... + 46117.

It is an arithmetic number, because the mean of its divisors is an integer number (69701742).

Almost surely, 2^278717983 is an apocalyptic number.

278717983 is a deficient number, since it is larger than the sum of its proper divisors (88985).

278717983 is an equidigital number, since it uses as much as digits as its factorization.

278717983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88984.

The product of its digits is 1185408, while the sum is 52.

The square root of 278717983 is about 16694.8489960227. The cubic root of 278717983 is about 653.2132669882.

The spelling of 278717983 in words is "two hundred seventy-eight million, seven hundred seventeen thousand, nine hundred eighty-three".