640410783 has 4 divisors (see below), whose sum is σ = 853881048. Its totient is φ = 426940520.

The previous prime is 640410779. The next prime is 640410821. The reversal of 640410783 is 387014046.

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 640410783 - 2² = 640410779 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640410703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106735128 + ... + 106735133.

It is an arithmetic number, because the mean of its divisors is an integer number (213470262).

Almost surely, 2^640410783 is an apocalyptic number.

640410783 is a deficient number, since it is larger than the sum of its proper divisors (213470265).

640410783 is a wasteful number, since it uses less digits than its factorization.

640410783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213470264.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 640410783 is about 25306.3387909038. The cubic root of 640410783 is about 861.9582126516.

The spelling of 640410783 in words is "six hundred forty million, four hundred ten thousand, seven hundred eighty-three".