1278800556 has 48 divisors (see below), whose sum is σ = 3278593920. Its totient is φ = 384721920.

The previous prime is 1278800543. The next prime is 1278800557. The reversal of 1278800556 is 6550088721.

It is not an unprimeable number, because it can be changed into a prime (1278800557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16501 + ... + 53196.

It is an arithmetic number, because the mean of its divisors is an integer number (68304040).

Almost surely, 2^1278800556 is an apocalyptic number.

It is an amenable number.

1278800556 is an abundant number, since it is smaller than the sum of its proper divisors (1999793364).

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

1278800556 is a wasteful number, since it uses less digits than its factorization.

1278800556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69854 (or 69852 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 1278800556 is about 35760.3209717139. The cubic root of 1278800556 is about 1085.4277956570.

The spelling of 1278800556 in words is "one billion, two hundred seventy-eight million, eight hundred thousand, five hundred fifty-six".