8640725 has 12 divisors (see below), whose sum is σ = 11279040. Its totient is φ = 6548400.

The previous prime is 8640719. The next prime is 8640733. The reversal of 8640725 is 5270468.

8640725 = 361² + 362² + ... + 417².

8640725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8640725 - 2¹⁸ = 8378581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8640691 and 8640700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8621 + ... + 9570.

It is an arithmetic number, because the mean of its divisors is an integer number (939920).

Almost surely, 2^8640725 is an apocalyptic number.

It is an amenable number.

8640725 is a deficient number, since it is larger than the sum of its proper divisors (2638315).

8640725 is a wasteful number, since it uses less digits than its factorization.

8640725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18220 (or 18215 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 8640725 is about 2939.5110137572. The cubic root of 8640725 is about 205.2028529433.

The spelling of 8640725 in words is "eight million, six hundred forty thousand, seven hundred twenty-five".