278989087 has 6 divisors (see below), whose sum is σ = 302100792. Its totient is φ = 257528232.

The previous prime is 278989079. The next prime is 278989099. The reversal of 278989087 is 780989872.

It is not a de Polignac number, because 278989087 - 2³ = 278989079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278989037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 825243 + ... + 825580.

It is an arithmetic number, because the mean of its divisors is an integer number (50350132).

Almost surely, 2^278989087 is an apocalyptic number.

278989087 is a deficient number, since it is larger than the sum of its proper divisors (23111705).

278989087 is a wasteful number, since it uses less digits than its factorization.

278989087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650849 (or 1650836 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 58.

The square root of 278989087 is about 16702.9664131854. The cubic root of 278989087 is about 653.4249879801.

The spelling of 278989087 in words is "two hundred seventy-eight million, nine hundred eighty-nine thousand, eighty-seven".