8581427064 has 160 divisors (see below), whose sum is σ = 28915708800. Its totient is φ = 2322768960.

The previous prime is 8581427027. The next prime is 8581427069. The reversal of 8581427064 is 4607241858.

8581427064 is a `hidden beast` number, since 8 + 581 + 4 + 2 + 7 + 0 + 64 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8581427069) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36399 + ... + 135969.

It is an arithmetic number, because the mean of its divisors is an integer number (180723180).

Almost surely, 2^8581427064 is an apocalyptic number.

8581427064 is a gapful number since it is divisible by the number (84) 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 8581427064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14457854400).

8581427064 is an abundant number, since it is smaller than the sum of its proper divisors (20334281736).

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

8581427064 is a wasteful number, since it uses less digits than its factorization.

8581427064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99615 (or 99602 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 8581427064 is about 92635.9922708231. The cubic root of 8581427064 is about 2047.3236590875.

The spelling of 8581427064 in words is "eight billion, five hundred eighty-one million, four hundred twenty-seven thousand, sixty-four".