1278331980 has 24 divisors (see below), whose sum is σ = 3579329712. Its totient is φ = 340888512.

The previous prime is 1278331979. The next prime is 1278331997. The reversal of 1278331980 is 891338721.

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, 10652707 + ... + 10652826.

It is an arithmetic number, because the mean of its divisors is an integer number (149138738).

Almost surely, 2^1278331980 is an apocalyptic number.

1278331980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278331980 is an abundant number, since it is smaller than the sum of its proper divisors (2300997732).

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

1278331980 is a wasteful number, since it uses less digits than its factorization.

1278331980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21305545 (or 21305543 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1278331980 is about 35753.7687523987. The cubic root of 1278331980 is about 1085.2952059044.

The spelling of 1278331980 in words is "one billion, two hundred seventy-eight million, three hundred thirty-one thousand, nine hundred eighty".