64445321 has 4 divisors (see below), whose sum is σ = 67837200. Its totient is φ = 61053444.

The previous prime is 64445309. The next prime is 64445327. The reversal of 64445321 is 12354446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64445321 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1695911 + ... + 1695948.

It is an arithmetic number, because the mean of its divisors is an integer number (16959300).

Almost surely, 2^64445321 is an apocalyptic number.

It is an amenable number.

64445321 is a deficient number, since it is larger than the sum of its proper divisors (3391879).

64445321 is a wasteful number, since it uses less digits than its factorization.

64445321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3391878.

The product of its digits is 11520, while the sum is 29.

The square root of 64445321 is about 8027.7843144918. The cubic root of 64445321 is about 400.9256085532.

Adding to 64445321 its reverse (12354446), we get a palindrome (76799767).

The spelling of 64445321 in words is "sixty-four million, four hundred forty-five thousand, three hundred twenty-one".