278994879 has 36 divisors (see below), whose sum is σ = 435428136. Its totient is φ = 172023264.

The previous prime is 278994857. The next prime is 278994887. The reversal of 278994879 is 978499872.

It is not a de Polignac number, because 278994879 - 2⁹ = 278994367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278994179) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 138709 + ... + 140705.

It is an arithmetic number, because the mean of its divisors is an integer number (12095226).

Almost surely, 2^278994879 is an apocalyptic number.

278994879 is a deficient number, since it is larger than the sum of its proper divisors (156433257).

278994879 is a wasteful number, since it uses less digits than its factorization.

278994879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084 (or 2062 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The square root of 278994879 is about 16703.1397946614. The cubic root of 278994879 is about 653.4295097954.

The spelling of 278994879 in words is "two hundred seventy-eight million, nine hundred ninety-four thousand, eight hundred seventy-nine".