278378113 has 8 divisors (see below), whose sum is σ = 301703528. Its totient is φ = 255325824.

The previous prime is 278378081. The next prime is 278378123. The reversal of 278378113 is 311873872.

It can be written as a sum of positive squares in 4 ways, for example, as 24039409 + 254338704 = 4903^2 + 15948^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 278378113 - 2⁵ = 278378081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278378123) 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 7 ways as a sum of consecutive naturals, for example, 66156 + ... + 70237.

It is an arithmetic number, because the mean of its divisors is an integer number (37712941).

Almost surely, 2^278378113 is an apocalyptic number.

It is an amenable number.

278378113 is a deficient number, since it is larger than the sum of its proper divisors (23325415).

278378113 is a wasteful number, since it uses less digits than its factorization.

278378113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136563.

The product of its digits is 56448, while the sum is 40.

The square root of 278378113 is about 16684.6670029701. The cubic root of 278378113 is about 652.9476485652.

The spelling of 278378113 in words is "two hundred seventy-eight million, three hundred seventy-eight thousand, one hundred thirteen".