64343993 has 8 divisors (see below), whose sum is σ = 73811520. Its totient is φ = 54945360.

The previous prime is 64343971. The next prime is 64344001. The reversal of 64343993 is 39934346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64343993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64343993.

It is not an unprimeable number, because it can be changed into a prime (64343933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15203 + ... + 18968.

It is an arithmetic number, because the mean of its divisors is an integer number (9226440).

Almost surely, 2^64343993 is an apocalyptic number.

It is an amenable number.

64343993 is a deficient number, since it is larger than the sum of its proper divisors (9467527).

64343993 is a wasteful number, since it uses less digits than its factorization.

64343993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34447.

The product of its digits is 209952, while the sum is 41.

The square root of 64343993 is about 8021.4707504297. The cubic root of 64343993 is about 400.7153719281.

The spelling of 64343993 in words is "sixty-four million, three hundred forty-three thousand, nine hundred ninety-three".