8927720820 has 72 divisors (see below), whose sum is σ = 27094723656. Its totient is φ = 2379497472.

The previous prime is 8927720701. The next prime is 8927720821. The reversal of 8927720820 is 280277298.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 705221136 + 8222499684 = 26556^2 + 90678^2 .

It is a super-2 number, since 2×8927720820² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8927720821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 368604 + ... + 392076.

Almost surely, 2^8927720820 is an apocalyptic number.

It is an amenable number.

8927720820 is an abundant number, since it is smaller than the sum of its proper divisors (18167002836).

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

8927720820 is a wasteful number, since it uses less digits than its factorization.

8927720820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25601 (or 25596 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 8927720820 is about 94486.6171476151. The cubic root of 8927720820 is about 2074.5004512843.

The spelling of 8927720820 in words is "eight billion, nine hundred twenty-seven million, seven hundred twenty thousand, eight hundred twenty".