8720501 has 4 divisors (see below), whose sum is σ = 8733132. Its totient is φ = 8707872.

The previous prime is 8720497. The next prime is 8720513. The reversal of 8720501 is 1050278.

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 8614225 + 106276 = 2935^2 + 326^2 .

It is a cyclic number.

It is not a de Polignac number, because 8720501 - 2² = 8720497 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 (8720531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5216 + ... + 6681.

It is an arithmetic number, because the mean of its divisors is an integer number (2183283).

Almost surely, 2^8720501 is an apocalyptic number.

It is an amenable number.

8720501 is a deficient number, since it is larger than the sum of its proper divisors (12631).

8720501 is a wasteful number, since it uses less digits than its factorization.

8720501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12630.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 8720501 is about 2953.0494408323. The cubic root of 8720501 is about 205.8324351377.

Adding to 8720501 its reverse (1050278), we get a palindrome (9770779).

The spelling of 8720501 in words is "eight million, seven hundred twenty thousand, five hundred one".