8870745721 has 8 divisors (see below), whose sum is σ = 9024366600. Its totient is φ = 8717389440.

The previous prime is 8870745701. The next prime is 8870745727. The reversal of 8870745721 is 1275470788.

8870745721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 60295225 + 8810450496 = 7765^2 + 93864^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8870745721 - 2⁹ = 8870745209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8870745727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2085 + ... + 133213.

It is an arithmetic number, because the mean of its divisors is an integer number (1128045825).

Almost surely, 2^8870745721 is an apocalyptic number.

It is an amenable number.

8870745721 is a deficient number, since it is larger than the sum of its proper divisors (153620879).

8870745721 is a wasteful number, since it uses less digits than its factorization.

8870745721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132299.

The product of its (nonzero) digits is 878080, while the sum is 49.

The square root of 8870745721 is about 94184.6363320473. The cubic root of 8870745721 is about 2070.0780012927.

The spelling of 8870745721 in words is "eight billion, eight hundred seventy million, seven hundred forty-five thousand, seven hundred twenty-one".