8644428786516 has 48 divisors (see below), whose sum is σ = 20488283648448. Its totient is φ = 2836215648000.

The previous prime is 8644428786493. The next prime is 8644428786517. The reversal of 8644428786516 is 6156878244468.

It is a super-2 number, since 2×8644428786516² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8644428786517) 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 15 ways as a sum of consecutive naturals, for example, 9618835 + ... + 10479066.

It is an arithmetic number, because the mean of its divisors is an integer number (426839242676).

Almost surely, 2^{8644428786516} is an apocalyptic number.

It is an amenable number.

8644428786516 is an abundant number, since it is smaller than the sum of its proper divisors (11843854861932).

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

8644428786516 is a wasteful number, since it uses less digits than its factorization.

8644428786516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20098472 (or 20098470 counting only the distinct ones).

The product of its digits is 495452160, while the sum is 69.

The spelling of 8644428786516 in words is "eight trillion, six hundred forty-four billion, four hundred twenty-eight million, seven hundred eighty-six thousand, five hundred sixteen".