640630704 has 160 divisors (see below), whose sum is σ = 1949875200. Its totient is φ = 181160448.

The previous prime is 640630693. The next prime is 640630747. The reversal of 640630704 is 407036046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2749372 + ... + 2749604.

It is an arithmetic number, because the mean of its divisors is an integer number (12186720).

Almost surely, 2^640630704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640630704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (974937600).

640630704 is an abundant number, since it is smaller than the sum of its proper divisors (1309244496).

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

640630704 is a wasteful number, since it uses less digits than its factorization.

640630704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 640630704 is about 25310.6835940873. The cubic root of 640630704 is about 862.0568686092.

The spelling of 640630704 in words is "six hundred forty million, six hundred thirty thousand, seven hundred four".