640410032 has 10 divisors (see below), whose sum is σ = 1240794468. Its totient is φ = 320205008.

The previous prime is 640410007. The next prime is 640410061. The reversal of 640410032 is 230014046.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 640409986 and 640410013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20012798 + ... + 20012829.

Almost surely, 2^640410032 is an apocalyptic number.

It is an amenable number.

640410032 is a deficient number, since it is larger than the sum of its proper divisors (600384436).

640410032 is a wasteful number, since it uses less digits than its factorization.

640410032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40025635 (or 40025629 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 640410032 is about 25306.3239527198. The cubic root of 640410032 is about 861.9578757163.

Adding to 640410032 its reverse (230014046), we get a palindrome (870424078).

The spelling of 640410032 in words is "six hundred forty million, four hundred ten thousand, thirty-two".