1278427604 has 12 divisors (see below), whose sum is σ = 2238264084. Its totient is φ = 638923584.

The previous prime is 1278427571. The next prime is 1278427609. The reversal of 1278427604 is 4067248721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1072562500 + 205865104 = 32750^2 + 14348^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278427609) 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 3 ways as a sum of consecutive naturals, for example, 62489 + ... + 80384.

It is an arithmetic number, because the mean of its divisors is an integer number (186522007).

Almost surely, 2^1278427604 is an apocalyptic number.

It is an amenable number.

1278427604 is a deficient number, since it is larger than the sum of its proper divisors (959836480).

1278427604 is a wasteful number, since it uses less digits than its factorization.

1278427604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145114 (or 145112 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 41.

The square root of 1278427604 is about 35755.1059850198. The cubic root of 1278427604 is about 1085.3222666061.

The spelling of 1278427604 in words is "one billion, two hundred seventy-eight million, four hundred twenty-seven thousand, six hundred four".