640116930 has 16 divisors (see below), whose sum is σ = 1536280704. Its totient is φ = 170697840.

The previous prime is 640116853. The next prime is 640116931. The reversal of 640116930 is 39611046.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 21337231 = 640116930 / (6 + 4 + 0 + 1 + 1 + 6 + 9 + 3 + 0).

It is not an unprimeable number, because it can be changed into a prime (640116931) 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 7 ways as a sum of consecutive naturals, for example, 10668586 + ... + 10668645.

It is an arithmetic number, because the mean of its divisors is an integer number (96017544).

Almost surely, 2^640116930 is an apocalyptic number.

640116930 is an abundant number, since it is smaller than the sum of its proper divisors (896163774).

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

640116930 is a wasteful number, since it uses less digits than its factorization.

640116930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21337241.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 640116930 is about 25300.5322078410. The cubic root of 640116930 is about 861.8263557435.

Adding to 640116930 its reverse (39611046), we get a palindrome (679727976).

The spelling of 640116930 in words is "six hundred forty million, one hundred sixteen thousand, nine hundred thirty".