640710000000 has 1280 divisors, whose sum is σ = 2748016402560. Its totient is φ = 145152000000.

The previous prime is 640709999999. The next prime is 640710000013. The reversal of 640710000000 is 17046.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 16950 × 2250 × 16800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 5669999944 + ... + 5670000056.

Almost surely, 2^640710000000 is an apocalyptic number.

640710000000 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 640710000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374008201280).

640710000000 is an abundant number, since it is smaller than the sum of its proper divisors (2107306402560).

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

640710000000 is an frugal number, since it uses more digits than its factorization.

640710000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

Adding to 640710000000 its reverse (17046), we get a palindrome (640710017046).

The spelling of 640710000000 in words is "six hundred forty billion, seven hundred ten million", and thus it is an aban number.