64643323 has 4 divisors (see below), whose sum is σ = 64767448. Its totient is φ = 64519200.

The previous prime is 64643311. The next prime is 64643351. The reversal of 64643323 is 32334646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64643323 - 2¹⁷ = 64512251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64643303) 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, 61278 + ... + 62323.

It is an arithmetic number, because the mean of its divisors is an integer number (16191862).

Almost surely, 2^64643323 is an apocalyptic number.

64643323 is a deficient number, since it is larger than the sum of its proper divisors (124125).

64643323 is a wasteful number, since it uses less digits than its factorization.

64643323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124124.

The product of its digits is 31104, while the sum is 31.

The square root of 64643323 is about 8040.1071510273. The cubic root of 64643323 is about 401.3357904441.

Adding to 64643323 its reverse (32334646), we get a palindrome (96977969).

The spelling of 64643323 in words is "sixty-four million, six hundred forty-three thousand, three hundred twenty-three".