278530989 has 48 divisors (see below), whose sum is σ = 432733056. Its totient is φ = 158906880.

The previous prime is 278530957. The next prime is 278530997. The reversal of 278530989 is 989035872.

It is not a de Polignac number, because 278530989 - 2⁵ = 278530957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278530919) 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 47 ways as a sum of consecutive naturals, for example, 609249 + ... + 609705.

It is an arithmetic number, because the mean of its divisors is an integer number (9015272).

Almost surely, 2^278530989 is an apocalyptic number.

It is an amenable number.

278530989 is a deficient number, since it is larger than the sum of its proper divisors (154202067).

278530989 is a wasteful number, since it uses less digits than its factorization.

278530989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The square root of 278530989 is about 16689.2477062329. The cubic root of 278530989 is about 653.0671524020.

The spelling of 278530989 in words is "two hundred seventy-eight million, five hundred thirty thousand, nine hundred eighty-nine".