8461217520 has 240 divisors, whose sum is σ = 32733143040. Its totient is φ = 1918619136.

The previous prime is 8461217473. The next prime is 8461217521. The reversal of 8461217520 is 257121648.

8461217520 is a `hidden beast` number, since 8 + 4 + 6 + 121 + 7 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8461217521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 633471 + ... + 646689.

It is an arithmetic number, because the mean of its divisors is an integer number (136388096).

Almost surely, 2^8461217520 is an apocalyptic number.

8461217520 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 8461217520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16366571520).

8461217520 is an abundant number, since it is smaller than the sum of its proper divisors (24271925520).

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

8461217520 is a wasteful number, since it uses less digits than its factorization.

8461217520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13372 (or 13363 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 8461217520 is about 91984.8765830558. The cubic root of 8461217520 is about 2037.7189613505.

The spelling of 8461217520 in words is "eight billion, four hundred sixty-one million, two hundred seventeen thousand, five hundred twenty".