1280780944 has 45 divisors (see below), whose sum is σ = 2600781673. Its totient is φ = 610972736.

The previous prime is 1280780939. The next prime is 1280780951. The reversal of 1280780944 is 4490870821.

The square root of 1280780944 is 35788.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 302342544 + 978438400 = 17388^2 + 31280^2 .

It is a super-2 number, since 2×1280780944² = 3280799653027062272, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280780944.

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 8 ways as a sum of consecutive naturals, for example, 3292302 + ... + 3292690.

Almost surely, 2^1280780944 is an apocalyptic number.

1280780944 is the 35788-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280780944

1280780944 is an abundant number, since it is smaller than the sum of its proper divisors (1320000729).

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

1280780944 is an frugal number, since it uses more digits than its factorization.

1280780944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The cubic root of 1280780944 is about 1085.9878150953.

The spelling of 1280780944 in words is "one billion, two hundred eighty million, seven hundred eighty thousand, nine hundred forty-four".