210784730640 has 640 divisors, whose sum is σ = 762534051840. Its totient is φ = 47687270400.

The previous prime is 210784730621. The next prime is 210784730647. The reversal of 210784730640 is 46037487012.

It is a junction number, because it is equal to n+sod(n) for n = 210784730592 and 210784730601.

It is not an unprimeable number, because it can be changed into a prime (210784730647) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 313201344 + ... + 313202016.

It is an arithmetic number, because the mean of its divisors is an integer number (1191459456).

Almost surely, 2^210784730640 is an apocalyptic number.

210784730640 is a gapful number since it is divisible by the number (20) 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 210784730640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381267025920).

210784730640 is an abundant number, since it is smaller than the sum of its proper divisors (551749321200).

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

210784730640 is a wasteful number, since it uses less digits than its factorization.

210784730640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The spelling of 210784730640 in words is "two hundred ten billion, seven hundred eighty-four million, seven hundred thirty thousand, six hundred forty".