278838378 has 48 divisors (see below), whose sum is σ = 743573376. Its totient is φ = 73539360.

The previous prime is 278838377. The next prime is 278838379. The reversal of 278838378 is 873838872.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (278838377) and next prime (278838379).

It is not an unprimeable number, because it can be changed into a prime (278838377) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83478 + ... + 86753.

It is an arithmetic number, because the mean of its divisors is an integer number (15491112).

Almost surely, 2^278838378 is an apocalyptic number.

278838378 is an abundant number, since it is smaller than the sum of its proper divisors (464734998).

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

278838378 is a wasteful number, since it uses less digits than its factorization.

278838378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170259 (or 170256 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The square root of 278838378 is about 16698.4543596107. The cubic root of 278838378 is about 653.3073074343.

The spelling of 278838378 in words is "two hundred seventy-eight million, eight hundred thirty-eight thousand, three hundred seventy-eight".