278380049 has 4 divisors (see below), whose sum is σ = 294755364. Its totient is φ = 262004736.

The previous prime is 278380033. The next prime is 278380051. The reversal of 278380049 is 940083872.

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

It can be written as a sum of positive squares in 2 ways, for example, as 88491649 + 189888400 = 9407^2 + 13780^2 .

It is a cyclic number.

It is not a de Polignac number, because 278380049 - 2⁴ = 278380033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278379988 and 278380015.

It is not an unprimeable number, because it can be changed into a prime (278380079) 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, 8187632 + ... + 8187665.

It is an arithmetic number, because the mean of its divisors is an integer number (73688841).

Almost surely, 2^278380049 is an apocalyptic number.

It is an amenable number.

278380049 is a deficient number, since it is larger than the sum of its proper divisors (16375315).

278380049 is a wasteful number, since it uses less digits than its factorization.

278380049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16375314.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 278380049 is about 16684.7250202094. The cubic root of 278380049 is about 652.9491622184.

The spelling of 278380049 in words is "two hundred seventy-eight million, three hundred eighty thousand, forty-nine".