8126389640 has 64 divisors (see below), whose sum is σ = 19512576000. Its totient is φ = 3035225088.

The previous prime is 8126389633. The next prime is 8126389643. The reversal of 8126389640 is 469836218.

It is not an unprimeable number, because it can be changed into a prime (8126389643) 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, 39311 + ... + 133409.

It is an arithmetic number, because the mean of its divisors is an integer number (304884000).

Almost surely, 2^8126389640 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 8126389640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9756288000).

8126389640 is an abundant number, since it is smaller than the sum of its proper divisors (11386186360).

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

8126389640 is a wasteful number, since it uses less digits than its factorization.

8126389640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94254 (or 94250 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 8126389640 is about 90146.4898928405. The cubic root of 8126389640 is about 2010.4774853014.

The spelling of 8126389640 in words is "eight billion, one hundred twenty-six million, three hundred eighty-nine thousand, six hundred forty".