4008720085 has 4 divisors (see below), whose sum is σ = 4810464108. Its totient is φ = 3206976064.

The previous prime is 4008720059. The next prime is 4008720097. The reversal of 4008720085 is 5800278004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1799626084 + 2209094001 = 42422^2 + 47001^2 .

It is a cyclic number.

It is not a de Polignac number, because 4008720085 - 2⁹ = 4008719573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4008720085.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400872004 + ... + 400872013.

It is an arithmetic number, because the mean of its divisors is an integer number (1202616027).

Almost surely, 2^4008720085 is an apocalyptic number.

It is an amenable number.

4008720085 is a deficient number, since it is larger than the sum of its proper divisors (801744023).

4008720085 is an equidigital number, since it uses as much as digits as its factorization.

4008720085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801744022.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 4008720085 is about 63314.4539974878. The cubic root of 4008720085 is about 1588.5537374225.

Adding to 4008720085 its reverse (5800278004), we get a palindrome (9808998089).

The spelling of 4008720085 in words is "four billion, eight million, seven hundred twenty thousand, eighty-five".