8781061680 has 240 divisors, whose sum is σ = 31368617280. Its totient is φ = 2193702912.

The previous prime is 8781061661. The next prime is 8781061711. The reversal of 8781061680 is 861601878.

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

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 47 ways as a sum of consecutive naturals, for example, 2850381 + ... + 2853459.

It is an arithmetic number, because the mean of its divisors is an integer number (130702572).

Almost surely, 2^8781061680 is an apocalyptic number.

8781061680 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 8781061680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15684308640).

8781061680 is an abundant number, since it is smaller than the sum of its proper divisors (22587555600).

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

8781061680 is a wasteful number, since it uses less digits than its factorization.

8781061680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348 (or 3339 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 8781061680 is about 93707.3192445499. The cubic root of 8781061680 is about 2063.0781330266.

The spelling of 8781061680 in words is "eight billion, seven hundred eighty-one million, sixty-one thousand, six hundred eighty".