640558041 has 4 divisors (see below), whose sum is σ = 854077392. Its totient is φ = 427038692.

The previous prime is 640558033. The next prime is 640558069. The reversal of 640558041 is 140855046.

640558041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640558041 - 2³ = 640558033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640557993 and 640558011.

It is not an unprimeable number, because it can be changed into a prime (640558031) 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, 106759671 + ... + 106759676.

It is an arithmetic number, because the mean of its divisors is an integer number (213519348).

Almost surely, 2^640558041 is an apocalyptic number.

It is an amenable number.

640558041 is a deficient number, since it is larger than the sum of its proper divisors (213519351).

640558041 is a wasteful number, since it uses less digits than its factorization.

640558041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213519350.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 640558041 is about 25309.2481318588. The cubic root of 640558041 is about 862.0242746846.

It can be divided in two parts, 6405 and 58041, that added together give a palindrome (64446).

The spelling of 640558041 in words is "six hundred forty million, five hundred fifty-eight thousand, forty-one".