640601012 has 12 divisors (see below), whose sum is σ = 1126922496. Its totient is φ = 318623160.

The previous prime is 640601009. The next prime is 640601029. The reversal of 640601012 is 210106046.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418478 + ... + 420005.

It is an arithmetic number, because the mean of its divisors is an integer number (93910208).

Almost surely, 2^640601012 is an apocalyptic number.

It is an amenable number.

640601012 is a deficient number, since it is larger than the sum of its proper divisors (486321484).

640601012 is a wasteful number, since it uses less digits than its factorization.

640601012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838678 (or 838676 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 640601012 is about 25310.0970365584. The cubic root of 640601012 is about 862.0435501779.

Adding to 640601012 its reverse (210106046), we get a palindrome (850707058).

The spelling of 640601012 in words is "six hundred forty million, six hundred one thousand, twelve".