64504221 has 8 divisors (see below), whose sum is σ = 90532320. Its totient is φ = 40739472.

The previous prime is 64504147. The next prime is 64504249. The reversal of 64504221 is 12240546.

64504221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64504221 - 2⁹ = 64503709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64504191 and 64504200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64504421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 565770 + ... + 565883.

It is an arithmetic number, because the mean of its divisors is an integer number (11316540).

Almost surely, 2^64504221 is an apocalyptic number.

It is an amenable number.

64504221 is a deficient number, since it is larger than the sum of its proper divisors (26028099).

64504221 is a wasteful number, since it uses less digits than its factorization.

64504221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131675.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 64504221 is about 8031.4519857869. The cubic root of 64504221 is about 401.0477137604.

Adding to 64504221 its reverse (12240546), we get a palindrome (76744767).

The spelling of 64504221 in words is "sixty-four million, five hundred four thousand, two hundred twenty-one".