8720245 has 4 divisors (see below), whose sum is σ = 10464300. Its totient is φ = 6976192.

The previous prime is 8720233. The next prime is 8720281. The reversal of 8720245 is 5420278.

8720245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3122289 + 5597956 = 1767^2 + 2366^2 .

It is a cyclic number.

It is not a de Polignac number, because 8720245 - 2¹¹ = 8718197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872020 + ... + 872029.

It is an arithmetic number, because the mean of its divisors is an integer number (2616075).

Almost surely, 2^8720245 is an apocalyptic number.

It is an amenable number.

8720245 is a deficient number, since it is larger than the sum of its proper divisors (1744055).

8720245 is a wasteful number, since it uses less digits than its factorization.

8720245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744054.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 8720245 is about 2953.0060954898. The cubic root of 8720245 is about 205.8304209714.

The spelling of 8720245 in words is "eight million, seven hundred twenty thousand, two hundred forty-five".