8720075 has 24 divisors (see below), whose sum is σ = 13311648. Its totient is φ = 5518080.

The previous prime is 8720071. The next prime is 8720081. The reversal of 8720075 is 5700278.

8720075 = 813² + 814² + ... + 825².

It is not a de Polignac number, because 8720075 - 2² = 8720071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8720071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 359 + ... + 4191.

It is an arithmetic number, because the mean of its divisors is an integer number (554652).

Almost surely, 2^8720075 is an apocalyptic number.

8720075 is a deficient number, since it is larger than the sum of its proper divisors (4591573).

8720075 is a wasteful number, since it uses less digits than its factorization.

8720075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863 (or 3858 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 8720075 is about 2952.9773111218. The cubic root of 8720075 is about 205.8290834172.

The spelling of 8720075 in words is "eight million, seven hundred twenty thousand, seventy-five".