8500000000 has 180 divisors, whose sum is σ = 22456052388. Its totient is φ = 3200000000.

The previous prime is 8499999941. The next prime is 8500000013. The reversal of 8500000000 is 58.

It can be written as a sum of positive squares in 10 ways, for example, as 716525824 + 7783474176 = 26768^2 + 88224^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 499999992 + ... + 500000008.

Almost surely, 2^8500000000 is an apocalyptic number.

8500000000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8500000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11228026194).

8500000000 is an abundant number, since it is smaller than the sum of its proper divisors (13956052388).

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

8500000000 is an frugal number, since it uses more digits than its factorization.

8500000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 24 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 8500000000 is about 92195.4445729289. Note that the first 3 decimals coincide. The cubic root of 8500000000 is about 2040.8275509587.

Adding to 8500000000 its reverse (58), we get a palindrome (8500000058).

The spelling of 8500000000 in words is "eight billion, five hundred million", and thus it is an aban number.