8117129776 has 80 divisors (see below), whose sum is σ = 18903932928. Its totient is φ = 3302956800.

The previous prime is 8117129773. The next prime is 8117129777. The reversal of 8117129776 is 6779217118.

It is not an unprimeable number, because it can be changed into a prime (8117129771) 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, 161961 + ... + 206071.

Almost surely, 2^8117129776 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 8117129776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9451966464).

8117129776 is an abundant number, since it is smaller than the sum of its proper divisors (10786803152).

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

8117129776 is a wasteful number, since it uses less digits than its factorization.

8117129776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44210 (or 44204 counting only the distinct ones).

The product of its digits is 296352, while the sum is 49.

The square root of 8117129776 is about 90095.1151617001. The cubic root of 8117129776 is about 2009.7135616512.

The spelling of 8117129776 in words is "eight billion, one hundred seventeen million, one hundred twenty-nine thousand, seven hundred seventy-six".