278803240 has 64 divisors (see below), whose sum is σ = 658627200. Its totient is φ = 106013952.

The previous prime is 278803237. The next prime is 278803253. The reversal of 278803240 is 42308872.

278803240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 278803196 and 278803205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163834 + ... + 165526.

It is an arithmetic number, because the mean of its divisors is an integer number (10291050).

Almost surely, 2^278803240 is an apocalyptic number.

278803240 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 278803240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329313600).

278803240 is an abundant number, since it is smaller than the sum of its proper divisors (379823960).

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

278803240 is a wasteful number, since it uses less digits than its factorization.

278803240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 278803240 is about 16697.4021931557. The cubic root of 278803240 is about 653.2798639660.

The spelling of 278803240 in words is "two hundred seventy-eight million, eight hundred three thousand, two hundred forty".