640032105 has 16 divisors (see below), whose sum is σ = 1051729344. Its totient is φ = 332124480.

The previous prime is 640032101. The next prime is 640032143. The reversal of 640032105 is 501230046.

It is a happy number.

It is not a de Polignac number, because 640032105 - 2² = 640032101 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (640032101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 576051 + ... + 577160.

It is an arithmetic number, because the mean of its divisors is an integer number (65733084).

Almost surely, 2^640032105 is an apocalyptic number.

It is an amenable number.

640032105 is a deficient number, since it is larger than the sum of its proper divisors (411697239).

640032105 is a wasteful number, since it uses less digits than its factorization.

640032105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153256.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 640032105 is about 25298.8558041663. The cubic root of 640032105 is about 861.7882857980.

The spelling of 640032105 in words is "six hundred forty million, thirty-two thousand, one hundred five".