278768420 has 48 divisors (see below), whose sum is σ = 670602240. Its totient is φ = 95355264.

The previous prime is 278768411. The next prime is 278768443. The reversal of 278768420 is 24867872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64982 + ... + 69138.

It is an arithmetic number, because the mean of its divisors is an integer number (13970880).

Almost surely, 2^278768420 is an apocalyptic number.

278768420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278768420 is an abundant number, since it is smaller than the sum of its proper divisors (391833820).

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

278768420 is a wasteful number, since it uses less digits than its factorization.

278768420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4652 (or 4650 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 44.

The square root of 278768420 is about 16696.3594834323. The cubic root of 278768420 is about 653.2526665873.

The spelling of 278768420 in words is "two hundred seventy-eight million, seven hundred sixty-eight thousand, four hundred twenty".