1287021648 has 80 divisors (see below), whose sum is σ = 3711476736. Its totient is φ = 380929920.

The previous prime is 1287021607. The next prime is 1287021707. The reversal of 1287021648 is 8461207821.

It is a happy number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 5640 + ... + 51047.

Almost surely, 2^1287021648 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 1287021648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1855738368).

1287021648 is an abundant number, since it is smaller than the sum of its proper divisors (2424455088).

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

1287021648 is a wasteful number, since it uses less digits than its factorization.

1287021648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56752 (or 56746 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 1287021648 is about 35875.0839441527. The cubic root of 1287021648 is about 1087.7488111368.

The spelling of 1287021648 in words is "one billion, two hundred eighty-seven million, twenty-one thousand, six hundred forty-eight".