278884478 has 4 divisors (see below), whose sum is σ = 418326720. Its totient is φ = 139442238.

The previous prime is 278884471. The next prime is 278884517. The reversal of 278884478 is 874488872.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278884471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69721118 + ... + 69721121.

It is an arithmetic number, because the mean of its divisors is an integer number (104581680).

Almost surely, 2^278884478 is an apocalyptic number.

278884478 is a deficient number, since it is larger than the sum of its proper divisors (139442242).

278884478 is a wasteful number, since it uses less digits than its factorization.

278884478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139442241.

The product of its digits is 6422528, while the sum is 56.

The square root of 278884478 is about 16699.8346698403. The cubic root of 278884478 is about 653.3433089434.

The spelling of 278884478 in words is "two hundred seventy-eight million, eight hundred eighty-four thousand, four hundred seventy-eight".