8666072640 has 168 divisors, whose sum is σ = 29855891520. Its totient is φ = 2307216384.

The previous prime is 8666072627. The next prime is 8666072651. The reversal of 8666072640 is 462706668.

It is a super-5 number, since 5×8666072640⁵ (a number of 51 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2091691 + ... + 2095829.

It is an arithmetic number, because the mean of its divisors is an integer number (177713640).

Almost surely, 2^8666072640 is an apocalyptic number.

8666072640 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 8666072640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14927945760).

8666072640 is an abundant number, since it is smaller than the sum of its proper divisors (21189818880).

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

8666072640 is a wasteful number, since it uses less digits than its factorization.

8666072640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4889 (or 4876 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 8666072640 is about 93091.7431354682. The cubic root of 8666072640 is about 2054.0331182419.

The spelling of 8666072640 in words is "eight billion, six hundred sixty-six million, seventy-two thousand, six hundred forty".