640400116 has 6 divisors (see below), whose sum is σ = 1120700210. Its totient is φ = 320200056.

The previous prime is 640400099. The next prime is 640400141. The reversal of 640400116 is 611004046.

It can be written as a sum of positive squares in only one way, i.e., 399840016 + 240560100 = 19996^2 + 15510^2 .

It is a super-2 number, since 2×640400116² = 820224617145626912, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 80050011 + ... + 80050018.

Almost surely, 2^640400116 is an apocalyptic number.

It is an amenable number.

640400116 is a deficient number, since it is larger than the sum of its proper divisors (480300094).

640400116 is a wasteful number, since it uses less digits than its factorization.

640400116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160100033 (or 160100031 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 640400116 is about 25306.1280325537. The cubic root of 640400116 is about 861.9534268903.

The spelling of 640400116 in words is "six hundred forty million, four hundred thousand, one hundred sixteen".