640704000000 has 728 divisors, whose sum is σ = 2211541691904. Its totient is φ = 164864000000.

The previous prime is 640703999987. The next prime is 640704000017. The reversal of 640704000000 is 407046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 9023999965 + ... + 9024000035.

Almost surely, 2^640704000000 is an apocalyptic number.

640704000000 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 640704000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1105770845952).

640704000000 is an abundant number, since it is smaller than the sum of its proper divisors (1570837691904).

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

640704000000 is an frugal number, since it uses more digits than its factorization.

640704000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

Adding to 640704000000 its reverse (407046), we get a palindrome (640704407046).

The spelling of 640704000000 in words is "six hundred forty billion, seven hundred four million", and thus it is an aban number.