640504512 has 168 divisors, whose sum is σ = 1961388000. Its totient is φ = 199139328.

The previous prime is 640504511. The next prime is 640504537. The reversal of 640504512 is 215405046.

640504512 is a `hidden beast` number, since 640 + 5 + 0 + 4 + 5 + 12 = 666.

It is not an unprimeable number, because it can be changed into a prime (640504511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1458789 + ... + 1459227.

Almost surely, 2^640504512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640504512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980694000).

640504512 is an abundant number, since it is smaller than the sum of its proper divisors (1320883488).

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

640504512 is a wasteful number, since it uses less digits than its factorization.

640504512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 640504512 is about 25308.1906109465. The cubic root of 640504512 is about 862.0002619853. Note that the first 3 decimals are identical.

Adding to 640504512 its reverse (215405046), we get a palindrome (855909558).

The spelling of 640504512 in words is "six hundred forty million, five hundred four thousand, five hundred twelve".