8220745 has 8 divisors (see below), whose sum is σ = 10623816. Its totient is φ = 6070656.

The previous prime is 8220743. The next prime is 8220767. The reversal of 8220745 is 5470228.

8220745 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 64009 + 8156736 = 253^2 + 2856^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8220745 - 2¹ = 8220743 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63172 + ... + 63301.

It is an arithmetic number, because the mean of its divisors is an integer number (1327977).

Almost surely, 2^8220745 is an apocalyptic number.

It is an amenable number.

8220745 is a deficient number, since it is larger than the sum of its proper divisors (2403071).

8220745 is a wasteful number, since it uses less digits than its factorization.

8220745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126491.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 8220745 is about 2867.1841587174. The cubic root of 8220745 is about 201.8228767910.

It can be divided in two parts, 82 and 20745, that multiplied together give a triangular number (1701090 = T₁₈₄₄).

The spelling of 8220745 in words is "eight million, two hundred twenty thousand, seven hundred forty-five".