1278875264 has 32 divisors (see below), whose sum is σ = 2601979200. Its totient is φ = 625829632.

The previous prime is 1278875261. The next prime is 1278875329. The reversal of 1278875264 is 4625788721.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (1278875261) 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 3 ways as a sum of consecutive naturals, for example, 100274 + ... + 112305.

It is an arithmetic number, because the mean of its divisors is an integer number (81311850).

Almost surely, 2^1278875264 is an apocalyptic number.

It is an amenable number.

1278875264 is an abundant number, since it is smaller than the sum of its proper divisors (1323103936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278875264 is an equidigital number, since it uses as much as digits as its factorization.

1278875264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212640 (or 212628 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 50.

The square root of 1278875264 is about 35761.3655220267. The cubic root of 1278875264 is about 1085.4489322761.

The spelling of 1278875264 in words is "one billion, two hundred seventy-eight million, eight hundred seventy-five thousand, two hundred sixty-four".