1280640979200 has 864 divisors, whose sum is σ = 4872803120640. Its totient is φ = 292936089600.

The previous prime is 1280640979171. The next prime is 1280640979217. The reversal of 1280640979200 is 29790460821.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1280640979200.

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 95 ways as a sum of consecutive naturals, for example, 1352313127 + ... + 1352314073.

Almost surely, 2^{1280640979200} is an apocalyptic number.

1280640979200 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 1280640979200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2436401560320).

1280640979200 is an abundant number, since it is smaller than the sum of its proper divisors (3592162141440).

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

1280640979200 is a wasteful number, since it uses less digits than its factorization.

1280640979200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 1280640979200 in words is "one trillion, two hundred eighty billion, six hundred forty million, nine hundred seventy-nine thousand, two hundred".