640836106 has 8 divisors (see below), whose sum is σ = 975601440. Its totient is φ = 315635628.

The previous prime is 640836073. The next prime is 640836107. The reversal of 640836106 is 601638046.

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

It is not an unprimeable number, because it can be changed into a prime (640836107) by changing a digit.

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, 2391046 + ... + 2391313.

It is an arithmetic number, because the mean of its divisors is an integer number (121950180).

Almost surely, 2^640836106 is an apocalyptic number.

640836106 is a deficient number, since it is larger than the sum of its proper divisors (334765334).

640836106 is a wasteful number, since it uses less digits than its factorization.

640836106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782428.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 640836106 is about 25314.7408835248. The cubic root of 640836106 is about 862.1489909937.

The spelling of 640836106 in words is "six hundred forty million, eight hundred thirty-six thousand, one hundred six".