1278140578 has 24 divisors (see below), whose sum is σ = 2264769936. Its totient is φ = 536281200.

The previous prime is 1278140569. The next prime is 1278140581. The reversal of 1278140578 is 8750418721.

It is an unprimeable number.

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, 168168 + ... + 175603.

It is an arithmetic number, because the mean of its divisors is an integer number (94365414).

Almost surely, 2^1278140578 is an apocalyptic number.

1278140578 is a deficient number, since it is larger than the sum of its proper divisors (986629358).

1278140578 is a wasteful number, since it uses less digits than its factorization.

1278140578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343810 (or 343797 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 1278140578 is about 35751.0919833227. The cubic root of 1278140578 is about 1085.2410368662.

The spelling of 1278140578 in words is "one billion, two hundred seventy-eight million, one hundred forty thousand, five hundred seventy-eight".