8158836864 has 128 divisors (see below), whose sum is σ = 22311072000. Its totient is φ = 2640568320.

The previous prime is 8158836859. The next prime is 8158836869. The reversal of 8158836864 is 4686388518.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8158836859) and next prime (8158836869).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (8158836869) 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, 1848292 + ... + 1852700.

It is an arithmetic number, because the mean of its divisors is an integer number (174305250).

Almost surely, 2^8158836864 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 8158836864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11155536000).

8158836864 is an abundant number, since it is smaller than the sum of its proper divisors (14152235136).

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

8158836864 is a wasteful number, since it uses less digits than its factorization.

8158836864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4566 (or 4554 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 57.

The square root of 8158836864 is about 90326.2800296791. The cubic root of 8158836864 is about 2013.1497577847.

The spelling of 8158836864 in words is "eight billion, one hundred fifty-eight million, eight hundred thirty-six thousand, eight hundred sixty-four".