8561172480 has 448 divisors, whose sum is σ = 32273199360. Its totient is φ = 1896873984.

The previous prime is 8561172479. The next prime is 8561172481. The reversal of 8561172480 is 842711658.

It is an interprime number because it is at equal distance from previous prime (8561172479) and next prime (8561172481).

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8561172481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31825786 + ... + 31826054.

Almost surely, 2^8561172480 is an apocalyptic number.

8561172480 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 8561172480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16136599680).

8561172480 is an abundant number, since it is smaller than the sum of its proper divisors (23712026880).

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

8561172480 is a wasteful number, since it uses less digits than its factorization.

8561172480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 8561172480 is about 92526.6041741509. The cubic root of 8561172480 is about 2045.7116367239.

The spelling of 8561172480 in words is "eight billion, five hundred sixty-one million, one hundred seventy-two thousand, four hundred eighty".