8420864 has 20 divisors (see below), whose sum is σ = 16826304. Its totient is φ = 4210176.

The previous prime is 8420843. The next prime is 8420869. The reversal of 8420864 is 4680248.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 8420864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7712 + ... + 8735.

Almost surely, 2^8420864 is an apocalyptic number.

It is an amenable number.

8420864 is a deficient number, since it is larger than the sum of its proper divisors (8405440).

8420864 is an equidigital number, since it uses as much as digits as its factorization.

8420864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16465 (or 16449 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 8420864 is about 2901.8724989220. The cubic root of 8420864 is about 203.4474345414.

The spelling of 8420864 in words is "eight million, four hundred twenty thousand, eight hundred sixty-four".