64445320 has 32 divisors (see below), whose sum is σ = 145589400. Its totient is φ = 25673728.

The previous prime is 64445309. The next prime is 64445327. The reversal of 64445320 is 2354446.

It can be written as a sum of positive squares in 4 ways, for example, as 61183684 + 3261636 = 7822^2 + 1806^2 .

It is not an unprimeable number, because it can be changed into a prime (64445327) 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, 7146 + ... + 13414.

Almost surely, 2^64445320 is an apocalyptic number.

It is an amenable number.

64445320 is an abundant number, since it is smaller than the sum of its proper divisors (81144080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64445320 is a wasteful number, since it uses less digits than its factorization.

64445320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6537 (or 6533 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 64445320 is about 8027.7842522081. The cubic root of 64445320 is about 400.9256064795.

Adding to 64445320 its reverse (2354446), we get a palindrome (66799766).

The spelling of 64445320 in words is "sixty-four million, four hundred forty-five thousand, three hundred twenty".