64991323 has 8 divisors (see below), whose sum is σ = 68928192. Its totient is φ = 61067136.

The previous prime is 64991321. The next prime is 64991347. The reversal of 64991323 is 32319946.

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

It is a cyclic number.

It is not a de Polignac number, because 64991323 - 2¹ = 64991321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64991321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8686 + ... + 14332.

It is an arithmetic number, because the mean of its divisors is an integer number (8616024).

Almost surely, 2^64991323 is an apocalyptic number.

64991323 is a deficient number, since it is larger than the sum of its proper divisors (3936869).

64991323 is a wasteful number, since it uses less digits than its factorization.

64991323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6341.

The product of its digits is 34992, while the sum is 37.

The square root of 64991323 is about 8061.7196056425. The cubic root of 64991323 is about 402.0546838641.

The spelling of 64991323 in words is "sixty-four million, nine hundred ninety-one thousand, three hundred twenty-three".