278390113 has 4 divisors (see below), whose sum is σ = 294766020. Its totient is φ = 262014208.

The previous prime is 278390107. The next prime is 278390149. The reversal of 278390113 is 311093872.

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 253669329 + 24720784 = 15927^2 + 4972^2 .

It is a cyclic number.

It is not a de Polignac number, because 278390113 - 2⁵ = 278390081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278990113) 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, 8187928 + ... + 8187961.

It is an arithmetic number, because the mean of its divisors is an integer number (73691505).

Almost surely, 2^278390113 is an apocalyptic number.

It is an amenable number.

278390113 is a deficient number, since it is larger than the sum of its proper divisors (16375907).

278390113 is a wasteful number, since it uses less digits than its factorization.

278390113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16375906.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 278390113 is about 16685.0266107070. The cubic root of 278390113 is about 652.9570305998.

The spelling of 278390113 in words is "two hundred seventy-eight million, three hundred ninety thousand, one hundred thirteen".