8638645 has 16 divisors (see below), whose sum is σ = 10663488. Its totient is φ = 6716160.

The previous prime is 8638633. The next prime is 8638661. The reversal of 8638645 is 5468368.

It is not a de Polignac number, because 8638645 - 2⁷ = 8638517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8638598 and 8638607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35725 + ... + 35965.

It is an arithmetic number, because the mean of its divisors is an integer number (666468).

Almost surely, 2^8638645 is an apocalyptic number.

It is an amenable number.

8638645 is a deficient number, since it is larger than the sum of its proper divisors (2024843).

8638645 is a wasteful number, since it uses less digits than its factorization.

8638645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420.

The product of its digits is 138240, while the sum is 40.

The square root of 8638645 is about 2939.1571921216. The cubic root of 8638645 is about 205.1863861079.

The spelling of 8638645 in words is "eight million, six hundred thirty-eight thousand, six hundred forty-five".