278972847 has 12 divisors (see below), whose sum is σ = 403146120. Its totient is φ = 185896368.

The previous prime is 278972843. The next prime is 278972851. The reversal of 278972847 is 748279872.

278972847 is a `hidden beast` number, since 278 + 97 + 284 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (278972843) and next prime (278972851).

It is not a de Polignac number, because 278972847 - 2² = 278972843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 278972793 and 278972802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278972843) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 18304 + ... + 29882.

It is an arithmetic number, because the mean of its divisors is an integer number (33595510).

Almost surely, 2^278972847 is an apocalyptic number.

278972847 is a deficient number, since it is larger than the sum of its proper divisors (124173273).

278972847 is a wasteful number, since it uses less digits than its factorization.

278972847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14262 (or 14259 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 278972847 is about 16702.4802649187. The cubic root of 278972847 is about 653.4123090760.

The spelling of 278972847 in words is "two hundred seventy-eight million, nine hundred seventy-two thousand, eight hundred forty-seven".