640006700 has 36 divisors (see below), whose sum is σ = 1402587312. Its totient is φ = 253464000.

The previous prime is 640006651. The next prime is 640006777. The reversal of 640006700 is 7600046.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21584 + ... + 41783.

Almost surely, 2^640006700 is an apocalyptic number.

It is an amenable number.

640006700 is an abundant number, since it is smaller than the sum of its proper divisors (762580612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640006700 is a wasteful number, since it uses less digits than its factorization.

640006700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63482 (or 63475 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 640006700 is about 25298.3537013775. The cubic root of 640006700 is about 861.7768832340.

Adding to 640006700 its reverse (7600046), we get a palindrome (647606746).

The spelling of 640006700 in words is "six hundred forty million, six thousand, seven hundred".