64040043 has 4 divisors (see below), whose sum is σ = 85386728. Its totient is φ = 42693360.

The previous prime is 64040021. The next prime is 64040047. The reversal of 64040043 is 34004046.

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

It is not a de Polignac number, because 64040043 - 2⁶ = 64039979 is a prime.

It is a super-2 number, since 2×64040043² = 8202254214883698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64040047) 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, 10673338 + ... + 10673343.

It is an arithmetic number, because the mean of its divisors is an integer number (21346682).

Almost surely, 2^64040043 is an apocalyptic number.

64040043 is a deficient number, since it is larger than the sum of its proper divisors (21346685).

64040043 is a wasteful number, since it uses less digits than its factorization.

64040043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21346684.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 64040043 is about 8002.5022961571. The cubic root of 64040043 is about 400.0834055243.

Adding to 64040043 its reverse (34004046), we get a palindrome (98044089).

The spelling of 64040043 in words is "sixty-four million, forty thousand, forty-three".