640463132 has 12 divisors (see below), whose sum is σ = 1148147616. Its totient is φ = 312420960.

The previous prime is 640463059. The next prime is 640463141. The reversal of 640463132 is 231364046.

It is a junction number, because it is equal to n+sod(n) for n = 640463095 and 640463104.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1952468 + ... + 1952795.

It is an arithmetic number, because the mean of its divisors is an integer number (95678968).

Almost surely, 2^640463132 is an apocalyptic number.

It is an amenable number.

640463132 is a deficient number, since it is larger than the sum of its proper divisors (507684484).

640463132 is a wasteful number, since it uses less digits than its factorization.

640463132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905308 (or 3905306 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 640463132 is about 25307.3730758449. The cubic root of 640463132 is about 861.9816983175.

The spelling of 640463132 in words is "six hundred forty million, four hundred sixty-three thousand, one hundred thirty-two".