278478882 has 24 divisors (see below), whose sum is σ = 658223280. Its totient is φ = 84387480.

The previous prime is 278478821. The next prime is 278478899. The reversal of 278478882 is 288874872.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 703032 + ... + 703427.

It is an arithmetic number, because the mean of its divisors is an integer number (27425970).

Almost surely, 2^278478882 is an apocalyptic number.

278478882 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

278478882 is an abundant number, since it is smaller than the sum of its proper divisors (379744398).

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

278478882 is a wasteful number, since it uses less digits than its factorization.

278478882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406478 (or 1406475 counting only the distinct ones).

The product of its digits is 3211264, while the sum is 54.

The square root of 278478882 is about 16687.6865382833. The cubic root of 278478882 is about 653.0264250458.

The spelling of 278478882 in words is "two hundred seventy-eight million, four hundred seventy-eight thousand, eight hundred eighty-two".