278159279 has 4 divisors (see below), whose sum is σ = 278503920. Its totient is φ = 277814640.

The previous prime is 278159269. The next prime is 278159347. The reversal of 278159279 is 972951872.

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 278159279 - 2⁸ = 278159023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278159269) 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, 171107 + ... + 172724.

It is an arithmetic number, because the mean of its divisors is an integer number (69625980).

Almost surely, 2^278159279 is an apocalyptic number.

278159279 is a deficient number, since it is larger than the sum of its proper divisors (344641).

278159279 is an equidigital number, since it uses as much as digits as its factorization.

278159279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344640.

The product of its digits is 635040, while the sum is 50.

The square root of 278159279 is about 16678.1077763636. The cubic root of 278159279 is about 652.7765089093.

The spelling of 278159279 in words is "two hundred seventy-eight million, one hundred fifty-nine thousand, two hundred seventy-nine".