8564663640828 has 24 divisors (see below), whose sum is σ = 20853094082688. Its totient is φ = 2730762320176.

The previous prime is 8564663640787. The next prime is 8564663640931. The reversal of 8564663640828 is 8280463664658.

It is a super-2 number, since 2×8564663640828² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15515694726 + ... + 15515695277.

It is an arithmetic number, because the mean of its divisors is an integer number (868878920112).

Almost surely, 2^{8564663640828} is an apocalyptic number.

It is an amenable number.

8564663640828 is an abundant number, since it is smaller than the sum of its proper divisors (12288430441860).

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

8564663640828 is a wasteful number, since it uses less digits than its factorization.

8564663640828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31031390033 (or 31031390031 counting only the distinct ones).

The product of its (nonzero) digits is 318504960, while the sum is 66.

The spelling of 8564663640828 in words is "eight trillion, five hundred sixty-four billion, six hundred sixty-three million, six hundred forty thousand, eight hundred twenty-eight".