64640343 has 4 divisors (see below), whose sum is σ = 86187128. Its totient is φ = 43093560.

The previous prime is 64640339. The next prime is 64640347. The reversal of 64640343 is 34304646.

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

It is an interprime number because it is at equal distance from previous prime (64640339) and next prime (64640347).

It is not a de Polignac number, because 64640343 - 2² = 64640339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64640343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640347) 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, 10773388 + ... + 10773393.

It is an arithmetic number, because the mean of its divisors is an integer number (21546782).

Almost surely, 2^64640343 is an apocalyptic number.

64640343 is a deficient number, since it is larger than the sum of its proper divisors (21546785).

64640343 is a wasteful number, since it uses less digits than its factorization.

64640343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21546784.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 64640343 is about 8039.9218279782. The cubic root of 64640343 is about 401.3296232744.

Adding to 64640343 its reverse (34304646), we get a palindrome (98944989).

The spelling of 64640343 in words is "sixty-four million, six hundred forty thousand, three hundred forty-three".