64845321 has 4 divisors (see below), whose sum is σ = 86460432. Its totient is φ = 43230212.

The previous prime is 64845301. The next prime is 64845323. The reversal of 64845321 is 12354846.

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 64845321 - 2¹⁸ = 64583177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64845323) 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, 10807551 + ... + 10807556.

It is an arithmetic number, because the mean of its divisors is an integer number (21615108).

Almost surely, 2^64845321 is an apocalyptic number.

It is an amenable number.

64845321 is a deficient number, since it is larger than the sum of its proper divisors (21615111).

64845321 is a wasteful number, since it uses less digits than its factorization.

64845321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21615110.

The product of its digits is 23040, while the sum is 33.

The square root of 64845321 is about 8052.6592502105. The cubic root of 64845321 is about 401.7533882603.

The spelling of 64845321 in words is "sixty-four million, eight hundred forty-five thousand, three hundred twenty-one".