1280769648 has 20 divisors (see below), whose sum is σ = 3308655048. Its totient is φ = 426923200.

The previous prime is 1280769641. The next prime is 1280769649. The reversal of 1280769648 is 8469670821.

It is a self number, because there is not a number n which added to its sum of digits gives 1280769648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280769641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13341303 + ... + 13341398.

Almost surely, 2^1280769648 is an apocalyptic number.

It is an amenable number.

1280769648 is an abundant number, since it is smaller than the sum of its proper divisors (2027885400).

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

1280769648 is a wasteful number, since it uses less digits than its factorization.

1280769648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26682712 (or 26682706 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The square root of 1280769648 is about 35787.8421813889. The cubic root of 1280769648 is about 1085.9846224196.

The spelling of 1280769648 in words is "one billion, two hundred eighty million, seven hundred sixty-nine thousand, six hundred forty-eight".