640409714 has 24 divisors (see below), whose sum is σ = 1128986460. Its totient is φ = 271627776.

The previous prime is 640409713. The next prime is 640409741. The reversal of 640409714 is 417904046.

It can be written as a sum of positive squares in 2 ways, for example, as 543682489 + 96727225 = 23317^2 + 9835^2 .

It is a super-3 number, since 3×640409714³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (640409713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24179 + ... + 43190.

Almost surely, 2^640409714 is an apocalyptic number.

640409714 is a deficient number, since it is larger than the sum of its proper divisors (488576746).

640409714 is a wasteful number, since it uses less digits than its factorization.

640409714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67482 (or 67475 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 640409714 is about 25306.3176697045. The cubic root of 640409714 is about 861.9577330460.

The spelling of 640409714 in words is "six hundred forty million, four hundred nine thousand, seven hundred fourteen".