1280386072 has 80 divisors (see below), whose sum is σ = 2823408000. Its totient is φ = 544299840.

The previous prime is 1280386069. The next prime is 1280386091. The reversal of 1280386072 is 2706830821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3668554 + ... + 3668902.

It is an arithmetic number, because the mean of its divisors is an integer number (35292600).

Almost surely, 2^1280386072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280386072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1411704000).

1280386072 is an abundant number, since it is smaller than the sum of its proper divisors (1543021928).

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

1280386072 is an equidigital number, since it uses as much as digits as its factorization.

1280386072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 1280386072 is about 35782.4827534368. The cubic root of 1280386072 is about 1085.8761982311.

The spelling of 1280386072 in words is "one billion, two hundred eighty million, three hundred eighty-six thousand, seventy-two".