8216500820 has 48 divisors (see below), whose sum is σ = 18856974528. Its totient is φ = 2982466560.

The previous prime is 8216500783. The next prime is 8216500823. The reversal of 8216500820 is 280056128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216500823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90692 + ... + 157028.

It is an arithmetic number, because the mean of its divisors is an integer number (392853636).

Almost surely, 2^8216500820 is an apocalyptic number.

It is an amenable number.

8216500820 is an abundant number, since it is smaller than the sum of its proper divisors (10640473708).

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

8216500820 is a wasteful number, since it uses less digits than its factorization.

8216500820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66920 (or 66918 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 8216500820 is about 90644.9161288155. The cubic root of 8216500820 is about 2017.8813865520.

Adding to 8216500820 its reverse (280056128), we get a palindrome (8496556948).

The spelling of 8216500820 in words is "eight billion, two hundred sixteen million, five hundred thousand, eight hundred twenty".