1287976665724 has 72 divisors (see below), whose sum is σ = 2631648121872. Its totient is φ = 549950446080.

The previous prime is 1287976665713. The next prime is 1287976665727. The reversal of 1287976665724 is 4275666797821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287976665727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 233284084 + ... + 233289604.

Almost surely, 2^{1287976665724} is an apocalyptic number.

1287976665724 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287976665724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1315824060936).

1287976665724 is an abundant number, since it is smaller than the sum of its proper divisors (1343671456148).

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

1287976665724 is a wasteful number, since it uses less digits than its factorization.

1287976665724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9723 (or 9714 counting only the distinct ones).

The product of its digits is 426746880, while the sum is 70.

The spelling of 1287976665724 in words is "one trillion, two hundred eighty-seven billion, nine hundred seventy-six million, six hundred sixty-five thousand, seven hundred twenty-four".