64326221 has 4 divisors (see below), whose sum is σ = 65694912. Its totient is φ = 62957532.

The previous prime is 64326217. The next prime is 64326257. The reversal of 64326221 is 12262346.

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 not a de Polignac number, because 64326221 - 2² = 64326217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64326121) 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, 684275 + ... + 684368.

It is an arithmetic number, because the mean of its divisors is an integer number (16423728).

Almost surely, 2^64326221 is an apocalyptic number.

It is an amenable number.

64326221 is a deficient number, since it is larger than the sum of its proper divisors (1368691).

64326221 is a wasteful number, since it uses less digits than its factorization.

64326221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368690.

The product of its digits is 3456, while the sum is 26.

The square root of 64326221 is about 8020.3628970265. The cubic root of 64326221 is about 400.6784756098.

Adding to 64326221 its reverse (12262346), we get a palindrome (76588567).

The spelling of 64326221 in words is "sixty-four million, three hundred twenty-six thousand, two hundred twenty-one".