8518234640 has 80 divisors (see below), whose sum is σ = 20402712000. Its totient is φ = 3305519616.

The previous prime is 8518234573. The next prime is 8518234643. The reversal of 8518234640 is 464328158.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (8518234643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504251 + ... + 520869.

It is an arithmetic number, because the mean of its divisors is an integer number (255033900).

Almost surely, 2^8518234640 is an apocalyptic number.

8518234640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8518234640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10201356000).

8518234640 is an abundant number, since it is smaller than the sum of its proper divisors (11884477360).

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

8518234640 is a wasteful number, since it uses less digits than its factorization.

8518234640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16824 (or 16818 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The square root of 8518234640 is about 92294.2828131840. The cubic root of 8518234640 is about 2042.2858716020.

The spelling of 8518234640 in words is "eight billion, five hundred eighteen million, two hundred thirty-four thousand, six hundred forty".