1280632320 has 480 divisors, whose sum is σ = 5025106944. Its totient is φ = 298598400.

The previous prime is 1280632291. The next prime is 1280632337. The reversal of 1280632320 is 232360821.

1280632320 is a `hidden beast` number, since 1 + 2 + 8 + 0 + 632 + 3 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7856559 + ... + 7856721.

Almost surely, 2^1280632320 is an apocalyptic number.

1280632320 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 1280632320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2512553472).

1280632320 is an abundant number, since it is smaller than the sum of its proper divisors (3744474624).

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

1280632320 is a wasteful number, since it uses less digits than its factorization.

1280632320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1280632320 is about 35785.9234895510. The cubic root of 1280632320 is about 1085.9458068457.

The spelling of 1280632320 in words is "one billion, two hundred eighty million, six hundred thirty-two thousand, three hundred twenty".