8520643 has 4 divisors (see below), whose sum is σ = 8547840. Its totient is φ = 8493448.

The previous prime is 8520623. The next prime is 8520647. The reversal of 8520643 is 3460258.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8520643 - 2¹³ = 8512451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8520647) 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, 13123 + ... + 13756.

It is an arithmetic number, because the mean of its divisors is an integer number (2136960).

Almost surely, 2^8520643 is an apocalyptic number.

8520643 is a deficient number, since it is larger than the sum of its proper divisors (27197).

8520643 is a wasteful number, since it uses less digits than its factorization.

8520643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27196.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 8520643 is about 2919.0140458723. The cubic root of 8520643 is about 204.2478325256.

The spelling of 8520643 in words is "eight million, five hundred twenty thousand, six hundred forty-three".