1280012720 has 80 divisors (see below), whose sum is σ = 3442279680. Its totient is φ = 433558272.

The previous prime is 1280012717. The next prime is 1280012731. The reversal of 1280012720 is 272100821.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32711 + ... + 60249.

It is an arithmetic number, because the mean of its divisors is an integer number (43028496).

Almost surely, 2^1280012720 is an apocalyptic number.

1280012720 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 1280012720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1721139840).

1280012720 is an abundant number, since it is smaller than the sum of its proper divisors (2162266960).

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

1280012720 is a wasteful number, since it uses less digits than its factorization.

1280012720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27642 (or 27636 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1280012720 is about 35777.2654069592. The cubic root of 1280012720 is about 1085.7706432294.

The spelling of 1280012720 in words is "one billion, two hundred eighty million, twelve thousand, seven hundred twenty".