640606046 has 8 divisors (see below), whose sum is σ = 962281944. Its totient is φ = 319845400.

The previous prime is 640606039. The next prime is 640606063.

It is a happy number.

640606046 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×640606046² = 820752212343508232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227060 + ... + 229863.

It is an arithmetic number, because the mean of its divisors is an integer number (120285243).

Almost surely, 2^640606046 is an apocalyptic number.

640606046 is a deficient number, since it is larger than the sum of its proper divisors (321675898).

640606046 is a wasteful number, since it uses less digits than its factorization.

640606046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457626.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 640606046 is about 25310.1964828407. The cubic root of 640606046 is about 862.0458082220.

The spelling of 640606046 in words is "six hundred forty million, six hundred six thousand, forty-six".