278383855 has 4 divisors (see below), whose sum is σ = 334060632. Its totient is φ = 222707080.

The previous prime is 278383817. The next prime is 278383969. The reversal of 278383855 is 558383872.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 278383855 - 2¹⁹ = 277859567 is a prime.

It is a super-2 number, since 2×278383855² = 154995141449322050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278383799 and 278383808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27838381 + ... + 27838390.

It is an arithmetic number, because the mean of its divisors is an integer number (83515158).

Almost surely, 2^278383855 is an apocalyptic number.

278383855 is a deficient number, since it is larger than the sum of its proper divisors (55676777).

278383855 is an equidigital number, since it uses as much as digits as its factorization.

278383855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55676776.

The product of its digits is 1612800, while the sum is 49.

The square root of 278383855 is about 16684.8390762392. The cubic root of 278383855 is about 652.9521379024.

The spelling of 278383855 in words is "two hundred seventy-eight million, three hundred eighty-three thousand, eight hundred fifty-five".