64505421 has 12 divisors (see below), whose sum is σ = 93425280. Its totient is φ = 42887880.

The previous prime is 64505381. The next prime is 64505447. The reversal of 64505421 is 12450546.

64505421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64505421 - 2¹⁹ = 63981133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64505471) 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 11 ways as a sum of consecutive naturals, for example, 6045 + ... + 12866.

It is an arithmetic number, because the mean of its divisors is an integer number (7785440).

Almost surely, 2^64505421 is an apocalyptic number.

It is an amenable number.

64505421 is a deficient number, since it is larger than the sum of its proper divisors (28919859).

64505421 is a wasteful number, since it uses less digits than its factorization.

64505421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19296 (or 19293 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 64505421 is about 8031.5266917318. The cubic root of 64505421 is about 401.0502006998.

Adding to 64505421 its reverse (12450546), we get a palindrome (76955967).

The spelling of 64505421 in words is "sixty-four million, five hundred five thousand, four hundred twenty-one".