1287278648 has 8 divisors (see below), whose sum is σ = 2413647480. Its totient is φ = 643639320.

The previous prime is 1287278647. The next prime is 1287278683. The reversal of 1287278648 is 8468727821.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1287278648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287278647) by changing a digit.

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 as a sum of consecutive naturals, namely, 80454908 + ... + 80454923.

It is an arithmetic number, because the mean of its divisors is an integer number (301705935).

Almost surely, 2^1287278648 is an apocalyptic number.

It is an amenable number.

1287278648 is a deficient number, since it is larger than the sum of its proper divisors (1126368832).

1287278648 is a wasteful number, since it uses less digits than its factorization.

1287278648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160909837 (or 160909833 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 53.

The square root of 1287278648 is about 35878.6656385100. The cubic root of 1287278648 is about 1087.8212089968.

The spelling of 1287278648 in words is "one billion, two hundred eighty-seven million, two hundred seventy-eight thousand, six hundred forty-eight".