1276978128 has 40 divisors (see below), whose sum is σ = 3379325376. Its totient is φ = 415276800.

The previous prime is 1276978117. The next prime is 1276978187. The reversal of 1276978128 is 8218796721.

It is a congruent 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, 322468 + ... + 326403.

Almost surely, 2^1276978128 is an apocalyptic number.

It is an amenable number.

1276978128 is an abundant number, since it is smaller than the sum of its proper divisors (2102347248).

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

1276978128 is a wasteful number, since it uses less digits than its factorization.

1276978128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648923 (or 648917 counting only the distinct ones).

The product of its digits is 677376, while the sum is 51.

The square root of 1276978128 is about 35734.8307397698. The cubic root of 1276978128 is about 1084.9119335035.

The spelling of 1276978128 in words is "one billion, two hundred seventy-six million, nine hundred seventy-eight thousand, one hundred twenty-eight".