278259240 has 192 divisors, whose sum is σ = 998092800. Its totient is φ = 61834752.

The previous prime is 278259229. The next prime is 278259257. The reversal of 278259240 is 42952872.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 216921 + ... + 218199.

It is an arithmetic number, because the mean of its divisors is an integer number (5198400).

Almost surely, 2^278259240 is an apocalyptic number.

278259240 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 278259240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (499046400).

278259240 is an abundant number, since it is smaller than the sum of its proper divisors (719833560).

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

278259240 is a wasteful number, since it uses less digits than its factorization.

278259240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1333 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 278259240 is about 16681.1042799930. The cubic root of 278259240 is about 652.8546947817.

The spelling of 278259240 in words is "two hundred seventy-eight million, two hundred fifty-nine thousand, two hundred forty".