278240787 has 12 divisors (see below), whose sum is σ = 438440184. Its totient is φ = 168630720.

The previous prime is 278240783. The next prime is 278240791. The reversal of 278240787 is 787042872.

It is an interprime number because it is at equal distance from previous prime (278240783) and next prime (278240791).

It is not a de Polignac number, because 278240787 - 2² = 278240783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (278240783) 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, 1405158 + ... + 1405355.

It is an arithmetic number, because the mean of its divisors is an integer number (36536682).

Almost surely, 2^278240787 is an apocalyptic number.

278240787 is a deficient number, since it is larger than the sum of its proper divisors (160199397).

278240787 is a wasteful number, since it uses less digits than its factorization.

278240787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810530 (or 2810527 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 45.

The square root of 278240787 is about 16680.5511599587. The cubic root of 278240787 is about 652.8402629231.

The spelling of 278240787 in words is "two hundred seventy-eight million, two hundred forty thousand, seven hundred eighty-seven".