278643248 has 20 divisors (see below), whose sum is σ = 581400288. Its totient is φ = 128604480.

The previous prime is 278643241. The next prime is 278643259. The reversal of 278643248 is 842346872.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 278643199 and 278643208.

It is not an unprimeable number, because it can be changed into a prime (278643241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669608 + ... + 670023.

Almost surely, 2^278643248 is an apocalyptic number.

It is an amenable number.

278643248 is an abundant number, since it is smaller than the sum of its proper divisors (302757040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278643248 is a wasteful number, since it uses less digits than its factorization.

278643248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339652 (or 1339646 counting only the distinct ones).

The product of its digits is 516096, while the sum is 44.

The square root of 278643248 is about 16692.6105807330. The cubic root of 278643248 is about 653.1548779110.

The spelling of 278643248 in words is "two hundred seventy-eight million, six hundred forty-three thousand, two hundred forty-eight".