1280648880 has 280 divisors, whose sum is σ = 5103592992. Its totient is φ = 292626432.

The previous prime is 1280648861. The next prime is 1280648881. The reversal of 1280648880 is 888460821.

It is a happy number.

1280648880 is a `hidden beast` number, since 12 + 80 + 6 + 488 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1280648881) by changing a digit.

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 55 ways as a sum of consecutive naturals, for example, 406672 + ... + 409808.

Almost surely, 2^1280648880 is an apocalyptic number.

1280648880 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 1280648880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2551796496).

1280648880 is an abundant number, since it is smaller than the sum of its proper divisors (3822944112).

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

1280648880 is an equidigital number, since it uses as much as digits as its factorization.

1280648880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3175 (or 3154 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 45.

The square root of 1280648880 is about 35786.1548646959. The cubic root of 1280648880 is about 1085.9504876545.

The spelling of 1280648880 in words is "one billion, two hundred eighty million, six hundred forty-eight thousand, eight hundred eighty".