64040943 has 4 divisors (see below), whose sum is σ = 85387928. Its totient is φ = 42693960.

The previous prime is 64040941. The next prime is 64040981. The reversal of 64040943 is 34904046.

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

It is not a de Polignac number, because 64040943 - 2¹ = 64040941 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 64040943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64040941) 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, 10673488 + ... + 10673493.

It is an arithmetic number, because the mean of its divisors is an integer number (21346982).

Almost surely, 2^64040943 is an apocalyptic number.

64040943 is a deficient number, since it is larger than the sum of its proper divisors (21346985).

64040943 is a wasteful number, since it uses less digits than its factorization.

64040943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21346984.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 64040943 is about 8002.5585283708. The cubic root of 64040943 is about 400.0852797338.

Adding to 64040943 its reverse (34904046), we get a palindrome (98944989).

The spelling of 64040943 in words is "sixty-four million, forty thousand, nine hundred forty-three".