8431159640 has 64 divisors (see below), whose sum is σ = 19884886560. Its totient is φ = 3213665280.

The previous prime is 8431159637. The next prime is 8431159643. The reversal of 8431159640 is 469511348.

It is an interprime number because it is at equal distance from previous prime (8431159637) and next prime (8431159643).

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8431159643) 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, 10742 + ... + 130298.

Almost surely, 2^8431159640 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 8431159640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9942443280).

8431159640 is an abundant number, since it is smaller than the sum of its proper divisors (11453726920).

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

8431159640 is a wasteful number, since it uses less digits than its factorization.

8431159640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119652 (or 119648 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 8431159640 is about 91821.3463199054. The cubic root of 8431159640 is about 2035.3031473322.

The spelling of 8431159640 in words is "eight billion, four hundred thirty-one million, one hundred fifty-nine thousand, six hundred forty".