1278320875 has 16 divisors (see below), whose sum is σ = 1718065440. Its totient is φ = 943989600.

The previous prime is 1278320863. The next prime is 1278320891. The reversal of 1278320875 is 5780238721.

It is not a de Polignac number, because 1278320875 - 2¹⁹ = 1277796587 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391705 + ... + 394954.

It is an arithmetic number, because the mean of its divisors is an integer number (107379090).

Almost surely, 2^1278320875 is an apocalyptic number.

1278320875 is a deficient number, since it is larger than the sum of its proper divisors (439744565).

1278320875 is an equidigital number, since it uses as much as digits as its factorization.

1278320875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786687 (or 786677 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 1278320875 is about 35753.6134537476. The cubic root of 1278320875 is about 1085.2920632053.

The spelling of 1278320875 in words is "one billion, two hundred seventy-eight million, three hundred twenty thousand, eight hundred seventy-five".