278828238 has 16 divisors (see below), whose sum is σ = 600553296. Its totient is φ = 85793280.

The previous prime is 278828233. The next prime is 278828257. The reversal of 278828238 is 832828872.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278828233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1787283 + ... + 1787438.

It is an arithmetic number, because the mean of its divisors is an integer number (37534581).

Almost surely, 2^278828238 is an apocalyptic number.

278828238 is an abundant number, since it is smaller than the sum of its proper divisors (321725058).

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

278828238 is a wasteful number, since it uses less digits than its factorization.

278828238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574739.

The product of its digits is 688128, while the sum is 48.

The square root of 278828238 is about 16698.1507359348. The cubic root of 278828238 is about 653.2993881318.

The spelling of 278828238 in words is "two hundred seventy-eight million, eight hundred twenty-eight thousand, two hundred thirty-eight".