278400056 has 16 divisors (see below), whose sum is σ = 569454840. Its totient is φ = 126545440.

The previous prime is 278400053. The next prime is 278400091. The reversal of 278400056 is 650004872.

278400056 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 = 278399995 and 278400031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278400053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1581731 + ... + 1581906.

Almost surely, 2^278400056 is an apocalyptic number.

It is an amenable number.

278400056 is an abundant number, since it is smaller than the sum of its proper divisors (291054784).

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

278400056 is a wasteful number, since it uses less digits than its factorization.

278400056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163654 (or 3163650 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 278400056 is about 16685.3245698128. The cubic root of 278400056 is about 652.9648041930.

The spelling of 278400056 in words is "two hundred seventy-eight million, four hundred thousand, fifty-six".