1247986706428 has 96 divisors (see below), whose sum is σ = 2799668164608. Its totient is φ = 472546483200.

The previous prime is 1247986706387. The next prime is 1247986706429. The reversal of 1247986706428 is 8246076897421.

It is a self number, because there is not a number n which added to its sum of digits gives 1247986706428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247986706429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9977725 + ... + 10102027.

It is an arithmetic number, because the mean of its divisors is an integer number (29163210048).

Almost surely, 2^{1247986706428} 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 1247986706428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1399834082304).

1247986706428 is an abundant number, since it is smaller than the sum of its proper divisors (1551681458180).

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

1247986706428 is a wasteful number, since it uses less digits than its factorization.

1247986706428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125243 (or 125241 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 64.

The spelling of 1247986706428 in words is "one trillion, two hundred forty-seven billion, nine hundred eighty-six million, seven hundred six thousand, four hundred twenty-eight".