8428565 has 4 divisors (see below), whose sum is σ = 10114284. Its totient is φ = 6742848.

The previous prime is 8428547. The next prime is 8428591. The reversal of 8428565 is 5658248.

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 3129361 + 5299204 = 1769^2 + 2302^2 .

It is a cyclic number.

It is not a de Polignac number, because 8428565 - 2⁶ = 8428501 is a prime.

It is a Duffinian number.

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, 842852 + ... + 842861.

It is an arithmetic number, because the mean of its divisors is an integer number (2528571).

Almost surely, 2^8428565 is an apocalyptic number.

It is an amenable number.

8428565 is a deficient number, since it is larger than the sum of its proper divisors (1685719).

8428565 is a wasteful number, since it uses less digits than its factorization.

8428565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685718.

The product of its digits is 76800, while the sum is 38.

The square root of 8428565 is about 2903.1990975474. The cubic root of 8428565 is about 203.5094341703.

The spelling of 8428565 in words is "eight million, four hundred twenty-eight thousand, five hundred sixty-five".