8707121280 has 864 divisors, whose sum is σ = 36775933740. Its totient is φ = 1885593600.

The previous prime is 8707121243. The next prime is 8707121287. The reversal of 8707121280 is 821217078.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8104320576 + 602800704 = 90024^2 + 24552^2 .

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

It is not an unprimeable number, because it can be changed into a prime (8707121287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 280874865 + ... + 280874895.

Almost surely, 2^8707121280 is an apocalyptic number.

8707121280 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 8707121280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18387966870).

8707121280 is an abundant number, since it is smaller than the sum of its proper divisors (28068812460).

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

8707121280 is a wasteful number, since it uses less digits than its factorization.

8707121280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 8707121280 is about 93311.9567901135. The cubic root of 8707121280 is about 2057.2711282450.

The spelling of 8707121280 in words is "eight billion, seven hundred seven million, one hundred twenty-one thousand, two hundred eighty".