8450129640 has 128 divisors (see below), whose sum is σ = 25579670400. Its totient is φ = 2233082880.

The previous prime is 8450129593. The next prime is 8450129641. The reversal of 8450129640 is 469210548.

It is not an unprimeable number, because it can be changed into a prime (8450129641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10192746 + ... + 10193574.

It is an arithmetic number, because the mean of its divisors is an integer number (199841175).

Almost surely, 2^8450129640 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 8450129640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12789835200).

8450129640 is an abundant number, since it is smaller than the sum of its proper divisors (17129540760).

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

8450129640 is a wasteful number, since it uses less digits than its factorization.

8450129640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1503 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 8450129640 is about 91924.5867001859. The cubic root of 8450129640 is about 2036.8284724906.

The spelling of 8450129640 in words is "eight billion, four hundred fifty million, one hundred twenty-nine thousand, six hundred forty".