64281321 has 48 divisors (see below), whose sum is σ = 106229760. Its totient is φ = 37169280.

The previous prime is 64281299. The next prime is 64281323. The reversal of 64281321 is 12318246.

64281321 is a `hidden beast` number, since 64 + 281 + 321 = 666.

It is not a de Polignac number, because 64281321 - 2⁹ = 64280809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64281323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133960 + ... + 134438.

It is an arithmetic number, because the mean of its divisors is an integer number (2213120).

Almost surely, 2^64281321 is an apocalyptic number.

It is an amenable number.

64281321 is a deficient number, since it is larger than the sum of its proper divisors (41948439).

64281321 is a wasteful number, since it uses less digits than its factorization.

64281321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 563 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 64281321 is about 8017.5632831927. The cubic root of 64281321 is about 400.5852287673.

Adding to 64281321 its reverse (12318246), we get a palindrome (76599567).

The spelling of 64281321 in words is "sixty-four million, two hundred eighty-one thousand, three hundred twenty-one".