8216645 has 8 divisors (see below), whose sum is σ = 10379040. Its totient is φ = 6227280.

The previous prime is 8216641. The next prime is 8216647. The reversal of 8216645 is 5466128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8216645 - 2² = 8216641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216641) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 43151 + ... + 43340.

It is an arithmetic number, because the mean of its divisors is an integer number (1297380).

Almost surely, 2^8216645 is an apocalyptic number.

It is an amenable number.

8216645 is a deficient number, since it is larger than the sum of its proper divisors (2162395).

8216645 is a wasteful number, since it uses less digits than its factorization.

8216645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86515.

The product of its digits is 11520, while the sum is 32.

The square root of 8216645 is about 2866.4690823381. The cubic root of 8216645 is about 201.7893189485.

It can be divided in two parts, 821 and 6645, that multiplied together give a palindrome (5455545).

The spelling of 8216645 in words is "eight million, two hundred sixteen thousand, six hundred forty-five".