640404046 has 8 divisors (see below), whose sum is σ = 981044640. Its totient is φ = 313389168.

The previous prime is 640404043. The next prime is 640404049.

640404046 is nontrivially palindromic in base 10.

640404046 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (640404043) and next prime (640404049).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640404043) 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, 3406311 + ... + 3406498.

It is an arithmetic number, because the mean of its divisors is an integer number (122630580).

Almost surely, 2^640404046 is an apocalyptic number.

640404046 is a deficient number, since it is larger than the sum of its proper divisors (340640594).

640404046 is a wasteful number, since it uses less digits than its factorization.

640404046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6812858.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 640404046 is about 25306.2056816110. The cubic root of 640404046 is about 861.9551900953.

It can be divided in two parts, 64040 and 4046, that added together give a palindrome (68086).

The spelling of 640404046 in words is "six hundred forty million, four hundred four thousand, forty-six".