640484046 has 12 divisors (see below), whose sum is σ = 1387715472. Its totient is φ = 213494676.

The previous prime is 640484041. The next prime is 640484071.

640484046 is a `hidden beast` number, since 640 + 4 + 8 + 4 + 0 + 4 + 6 = 666.

640484046 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 640484046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640484041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17791206 + ... + 17791241.

It is an arithmetic number, because the mean of its divisors is an integer number (115642956).

Almost surely, 2^640484046 is an apocalyptic number.

640484046 is an abundant number, since it is smaller than the sum of its proper divisors (747231426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640484046 is a wasteful number, since it uses less digits than its factorization.

640484046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35582455 (or 35582452 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

The square root of 640484046 is about 25307.7862722127. The cubic root of 640484046 is about 861.9910807410.

The spelling of 640484046 in words is "six hundred forty million, four hundred eighty-four thousand, forty-six".