64240643 has 4 divisors (see below), whose sum is σ = 64485168. Its totient is φ = 63996120.

The previous prime is 64240639. The next prime is 64240651. The reversal of 64240643 is 34604246.

It is a happy number.

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 64240643 - 2² = 64240639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64243643) 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, 121868 + ... + 122393.

It is an arithmetic number, because the mean of its divisors is an integer number (16121292).

Almost surely, 2^64240643 is an apocalyptic number.

64240643 is a deficient number, since it is larger than the sum of its proper divisors (244525).

64240643 is a wasteful number, since it uses less digits than its factorization.

64240643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244524.

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 64240643 is about 8015.0260760649. The cubic root of 64240643 is about 400.5007125392.

Adding to 64240643 its reverse (34604246), we get a palindrome (98844889).

The spelling of 64240643 in words is "sixty-four million, two hundred forty thousand, six hundred forty-three".