8721780564 has 48 divisors (see below), whose sum is σ = 23265446400. Its totient is φ = 2491148256.

The previous prime is 8721780547. The next prime is 8721780569. The reversal of 8721780564 is 4650871278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721780569) 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 15 ways as a sum of consecutive naturals, for example, 282607 + ... + 311945.

It is an arithmetic number, because the mean of its divisors is an integer number (484696800).

Almost surely, 2^8721780564 is an apocalyptic number.

8721780564 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

8721780564 is an abundant number, since it is smaller than the sum of its proper divisors (14543665836).

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

8721780564 is a wasteful number, since it uses less digits than its factorization.

8721780564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32892 (or 32890 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 48.

The square root of 8721780564 is about 93390.4736255256. The cubic root of 8721780564 is about 2058.4250194822.

The spelling of 8721780564 in words is "eight billion, seven hundred twenty-one million, seven hundred eighty thousand, five hundred sixty-four".