1276555280 has 320 divisors, whose sum is σ = 4199731200. Its totient is φ = 347535360.

The previous prime is 1276555271. The next prime is 1276555303. The reversal of 1276555280 is 825556721.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1521101 + ... + 1521939.

It is an arithmetic number, because the mean of its divisors is an integer number (13124160).

Almost surely, 2^1276555280 is an apocalyptic number.

1276555280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1276555280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2099865600).

1276555280 is an abundant number, since it is smaller than the sum of its proper divisors (2923175920).

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

1276555280 is a wasteful number, since it uses less digits than its factorization.

1276555280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902 (or 896 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 1276555280 is about 35728.9137814180. The cubic root of 1276555280 is about 1084.7921706883.

The spelling of 1276555280 in words is "one billion, two hundred seventy-six million, five hundred fifty-five thousand, two hundred eighty".