1264078128 has 40 divisors (see below), whose sum is σ = 3268884528. Its totient is φ = 420927232.

The previous prime is 1264078099. The next prime is 1264078139. The reversal of 1264078128 is 8218704621.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 35626 + ... + 61622.

Almost surely, 2^1264078128 is an apocalyptic number.

It is an amenable number.

1264078128 is an abundant number, since it is smaller than the sum of its proper divisors (2004806400).

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

1264078128 is a wasteful number, since it uses less digits than its factorization.

1264078128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27021 (or 27015 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 1264078128 is about 35553.8764131283. The cubic root of 1264078128 is about 1081.2463115559.

The spelling of 1264078128 in words is "one billion, two hundred sixty-four million, seventy-eight thousand, one hundred twenty-eight".