8720545500 has 144 divisors (see below), whose sum is σ = 27634842144. Its totient is φ = 2314963200.

The previous prime is 8720545439. The next prime is 8720545511. The reversal of 8720545500 is 55450278.

It is a happy number.

8720545500 is a `hidden beast` number, since 87 + 20 + 5 + 4 + 550 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1017232 + ... + 1025768.

It is an arithmetic number, because the mean of its divisors is an integer number (191908626).

Almost surely, 2^8720545500 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 8720545500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13817421072).

8720545500 is an abundant number, since it is smaller than the sum of its proper divisors (18914296644).

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

8720545500 is a wasteful number, since it uses less digits than its factorization.

8720545500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8789 (or 8774 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 8720545500 is about 93383.8610253399. The cubic root of 8720545500 is about 2058.3278525245.

Adding to 8720545500 its reverse (55450278), we get a palindrome (8775995778).

The spelling of 8720545500 in words is "eight billion, seven hundred twenty million, five hundred forty-five thousand, five hundred".