640344711 has 16 divisors (see below), whose sum is σ = 883491840. Its totient is φ = 412114560.

The previous prime is 640344701. The next prime is 640344743. The reversal of 640344711 is 117443046.

It is not a de Polignac number, because 640344711 - 2⁶ = 640344647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640344701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30751 + ... + 47183.

It is an arithmetic number, because the mean of its divisors is an integer number (55218240).

Almost surely, 2^640344711 is an apocalyptic number.

640344711 is a deficient number, since it is larger than the sum of its proper divisors (243147129).

640344711 is a wasteful number, since it uses less digits than its factorization.

640344711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16886.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 640344711 is about 25305.0333135525. The cubic root of 640344711 is about 861.9285685215.

Adding to 640344711 its reverse (117443046), we get a palindrome (757787757).

The spelling of 640344711 in words is "six hundred forty million, three hundred forty-four thousand, seven hundred eleven".