1287144648 has 64 divisors (see below), whose sum is σ = 3578640000. Its totient is φ = 428659776.

The previous prime is 1287144643. The next prime is 1287144667. The reversal of 1287144648 is 8464417821.

It is not an unprimeable number, because it can be changed into a prime (1287144643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332661 + ... + 336507.

It is an arithmetic number, because the mean of its divisors is an integer number (55916250).

Almost surely, 2^1287144648 is an apocalyptic number.

1287144648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1287144648 is an abundant number, since it is smaller than the sum of its proper divisors (2291495352).

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

1287144648 is a wasteful number, since it uses less digits than its factorization.

1287144648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5411 (or 5401 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 1287144648 is about 35876.7981848994. The cubic root of 1287144648 is about 1087.7834618987.

The spelling of 1287144648 in words is "one billion, two hundred eighty-seven million, one hundred forty-four thousand, six hundred forty-eight".