8705435721 has 16 divisors (see below), whose sum is σ = 11804244480. Its totient is φ = 5705233920.

The previous prime is 8705435719. The next prime is 8705435729. The reversal of 8705435721 is 1275345078.

8705435721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8705435721 - 2¹ = 8705435719 is a prime.

It is a super-2 number, since 2×8705435721² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8705435729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333096 + ... + 358278.

It is an arithmetic number, because the mean of its divisors is an integer number (737765280).

Almost surely, 2^8705435721 is an apocalyptic number.

It is an amenable number.

8705435721 is a deficient number, since it is larger than the sum of its proper divisors (3098808759).

8705435721 is a wasteful number, since it uses less digits than its factorization.

8705435721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27136.

The product of its (nonzero) digits is 235200, while the sum is 42.

The square root of 8705435721 is about 93302.9245040047. The cubic root of 8705435721 is about 2057.1383681153.

The spelling of 8705435721 in words is "eight billion, seven hundred five million, four hundred thirty-five thousand, seven hundred twenty-one".