8129021976 has 80 divisors (see below), whose sum is σ = 22981776840. Its totient is φ = 2684327040.

The previous prime is 8129021939. The next prime is 8129021983. The reversal of 8129021976 is 6791209218.

8129021976 is a `hidden beast` number, since 81 + 290 + 219 + 76 = 666.

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, 10716 + ... + 127956.

Almost surely, 2^8129021976 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 8129021976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11490888420).

8129021976 is an abundant number, since it is smaller than the sum of its proper divisors (14852754864).

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

8129021976 is a wasteful number, since it uses less digits than its factorization.

8129021976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117366 (or 117353 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 8129021976 is about 90161.0890351265. The cubic root of 8129021976 is about 2010.6945427799.

The spelling of 8129021976 in words is "eight billion, one hundred twenty-nine million, twenty-one thousand, nine hundred seventy-six".