8720285285 has 8 divisors (see below), whose sum is σ = 10719570456. Its totient is φ = 6806076160.

The previous prime is 8720285281. The next prime is 8720285293. The reversal of 8720285285 is 5825820278.

It can be written as a sum of positive squares in 4 ways, for example, as 559511716 + 8160773569 = 23654^2 + 90337^2 .

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

It is not a de Polignac number, because 8720285285 - 2² = 8720285281 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720285281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21268784 + ... + 21269193.

It is an arithmetic number, because the mean of its divisors is an integer number (1339946307).

Almost surely, 2^8720285285 is an apocalyptic number.

It is an amenable number.

8720285285 is a deficient number, since it is larger than the sum of its proper divisors (1999285171).

8720285285 is a wasteful number, since it uses less digits than its factorization.

8720285285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42538023.

The product of its (nonzero) digits is 716800, while the sum is 47.

The square root of 8720285285 is about 93382.4677602814. The cubic root of 8720285285 is about 2058.3073792980.

The spelling of 8720285285 in words is "eight billion, seven hundred twenty million, two hundred eighty-five thousand, two hundred eighty-five".