640260106 has 8 divisors (see below), whose sum is σ = 961093764. Its totient is φ = 319895520.

The previous prime is 640260097. The next prime is 640260113. The reversal of 640260106 is 601062046.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 612117081 + 28143025 = 24741^2 + 5305^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113835 + ... + 119326.

Almost surely, 2^640260106 is an apocalyptic number.

640260106 is a deficient number, since it is larger than the sum of its proper divisors (320833658).

640260106 is a wasteful number, since it uses less digits than its factorization.

640260106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234536.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 640260106 is about 25303.3615553349. The cubic root of 640260106 is about 861.8906063233.

The spelling of 640260106 in words is "six hundred forty million, two hundred sixty thousand, one hundred six".