278847778 has 16 divisors (see below), whose sum is σ = 460564704. Its totient is φ = 125563360.

The previous prime is 278847703. The next prime is 278847797. The reversal of 278847778 is 877748872.

278847778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×278847778³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56875 + ... + 61582.

It is an arithmetic number, because the mean of its divisors is an integer number (28785294).

Almost surely, 2^278847778 is an apocalyptic number.

278847778 is a deficient number, since it is larger than the sum of its proper divisors (181716926).

278847778 is a wasteful number, since it uses less digits than its factorization.

278847778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118577.

The product of its digits is 9834496, while the sum is 58.

The square root of 278847778 is about 16698.7358204147. The cubic root of 278847778 is about 653.3146486280.

The spelling of 278847778 in words is "two hundred seventy-eight million, eight hundred forty-seven thousand, seven hundred seventy-eight".