8427645 has 20 divisors (see below), whose sum is σ = 15108060. Its totient is φ = 4494528.

The previous prime is 8427607. The next prime is 8427647. The reversal of 8427645 is 5467248.

8427645 is a `hidden beast` number, since 8 + 4 + 2 + 7 + 645 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2566404 + 5861241 = 1602^2 + 2421^2 .

It is not a de Polignac number, because 8427645 - 2⁶ = 8427581 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8427647) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10000 + ... + 10809.

It is an arithmetic number, because the mean of its divisors is an integer number (755403).

Almost surely, 2^8427645 is an apocalyptic number.

It is an amenable number.

8427645 is a deficient number, since it is larger than the sum of its proper divisors (6680415).

8427645 is a wasteful number, since it uses less digits than its factorization.

8427645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20826 (or 20817 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 8427645 is about 2903.0406473214. The cubic root of 8427645 is about 203.5020293712.

The spelling of 8427645 in words is "eight million, four hundred twenty-seven thousand, six hundred forty-five".