278217240 has 128 divisors (see below), whose sum is σ = 1010050560. Its totient is φ = 59848704.

The previous prime is 278217239. The next prime is 278217259. The reversal of 278217240 is 42712872.

278217240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4539 + ... + 24021.

It is an arithmetic number, because the mean of its divisors is an integer number (7891020).

Almost surely, 2^278217240 is an apocalyptic number.

278217240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278217240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505025280).

278217240 is an abundant number, since it is smaller than the sum of its proper divisors (731833320).

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

278217240 is a wasteful number, since it uses less digits than its factorization.

278217240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19521 (or 19517 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 278217240 is about 16679.8453230238. The cubic root of 278217240 is about 652.8218461848.

The spelling of 278217240 in words is "two hundred seventy-eight million, two hundred seventeen thousand, two hundred forty".