640065512 has 32 divisors (see below), whose sum is σ = 1223640000. Its totient is φ = 313790208.

The previous prime is 640065511. The next prime is 640065563. The reversal of 640065512 is 215560046.

It is not an unprimeable number, because it can be changed into a prime (640065511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205664 + ... + 208752.

It is an arithmetic number, because the mean of its divisors is an integer number (38238750).

Almost surely, 2^640065512 is an apocalyptic number.

It is an amenable number.

640065512 is a deficient number, since it is larger than the sum of its proper divisors (583574488).

640065512 is a wasteful number, since it uses less digits than its factorization.

640065512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593 (or 3589 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 640065512 is about 25299.5160428021. The cubic root of 640065512 is about 861.8032794523.

The spelling of 640065512 in words is "six hundred forty million, sixty-five thousand, five hundred twelve".