640431114 has 16 divisors (see below), whose sum is σ = 1281329280. Its totient is φ = 213399200.

The previous prime is 640431109. The next prime is 640431133. The reversal of 640431114 is 411134046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162 + ... + 35789.

It is an arithmetic number, because the mean of its divisors is an integer number (80083080).

Almost surely, 2^640431114 is an apocalyptic number.

640431114 is an abundant number, since it is smaller than the sum of its proper divisors (640898166).

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

640431114 is a wasteful number, since it uses less digits than its factorization.

640431114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38925.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 640431114 is about 25306.7404854912. The cubic root of 640431114 is about 861.9673340298.

The spelling of 640431114 in words is "six hundred forty million, four hundred thirty-one thousand, one hundred fourteen".