64523221 has 8 divisors (see below), whose sum is σ = 77622080. Its totient is φ = 52394688.

The previous prime is 64523197. The next prime is 64523237. The reversal of 64523221 is 12232546.

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 64523221 - 2⁵ = 64523189 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 (64523281) 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, 242436 + ... + 242701.

It is an arithmetic number, because the mean of its divisors is an integer number (9702760).

Almost surely, 2^64523221 is an apocalyptic number.

It is an amenable number.

64523221 is a deficient number, since it is larger than the sum of its proper divisors (13098859).

64523221 is a wasteful number, since it uses less digits than its factorization.

64523221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485163.

The product of its digits is 2880, while the sum is 25.

The square root of 64523221 is about 8032.6347483251. The cubic root of 64523221 is about 401.0870866800.

Adding to 64523221 its reverse (12232546), we get a palindrome (76755767).

The spelling of 64523221 in words is "sixty-four million, five hundred twenty-three thousand, two hundred twenty-one".