640646754000 has 320 divisors, whose sum is σ = 2301164716032. Its totient is φ = 152003136000.

The previous prime is 640646753849. The next prime is 640646754001. The reversal of 640646754000 is 457646046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640646754001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2998737 + ... + 3205263.

Almost surely, 2^640646754000 is an apocalyptic number.

640646754000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640646754000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1150582358016).

640646754000 is an abundant number, since it is smaller than the sum of its proper divisors (1660517962032).

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

640646754000 is a wasteful number, since it uses less digits than its factorization.

640646754000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206611 (or 206595 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The spelling of 640646754000 in words is "six hundred forty billion, six hundred forty-six million, seven hundred fifty-four thousand".