64220445 has 40 divisors (see below), whose sum is σ = 115756344. Its totient is φ = 34062336.

The previous prime is 64220417. The next prime is 64220447. The reversal of 64220445 is 54402246.

It can be written as a sum of positive squares in 4 ways, for example, as 7338681 + 56881764 = 2709^2 + 7542^2 .

It is not a de Polignac number, because 64220445 - 2¹¹ = 64218397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64220447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 103777 + ... + 104393.

Almost surely, 2^64220445 is an apocalyptic number.

It is an amenable number.

64220445 is a deficient number, since it is larger than the sum of its proper divisors (51535899).

64220445 is a wasteful number, since it uses less digits than its factorization.

64220445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 64220445 is about 8013.7659686317. The cubic root of 64220445 is about 400.4587341231.

The spelling of 64220445 in words is "sixty-four million, two hundred twenty thousand, four hundred forty-five".