278440028 has 6 divisors (see below), whose sum is σ = 487270056. Its totient is φ = 139220012.

The previous prime is 278440027. The next prime is 278440039. The reversal of 278440028 is 820044872.

It is a self number, because there is not a number n which added to its sum of digits gives 278440028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278440027) 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 as a sum of consecutive naturals, namely, 34805000 + ... + 34805007.

It is an arithmetic number, because the mean of its divisors is an integer number (81211676).

Almost surely, 2^278440028 is an apocalyptic number.

It is an amenable number.

278440028 is a deficient number, since it is larger than the sum of its proper divisors (208830028).

278440028 is a wasteful number, since it uses less digits than its factorization.

278440028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69610011 (or 69610009 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 278440028 is about 16686.5223458934. The cubic root of 278440028 is about 652.9960530613.

The spelling of 278440028 in words is "two hundred seventy-eight million, four hundred forty thousand, twenty-eight".