209293934640 has 320 divisors, whose sum is σ = 790779386880. Its totient is φ = 44699811840.

The previous prime is 209293934581. The next prime is 209293934711. The reversal of 209293934640 is 46439392902.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3943480 + ... + 3996200.

It is an arithmetic number, because the mean of its divisors is an integer number (2471185584).

Almost surely, 2^209293934640 is an apocalyptic number.

209293934640 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 209293934640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395389693440).

209293934640 is an abundant number, since it is smaller than the sum of its proper divisors (581485452240).

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

209293934640 is a wasteful number, since it uses less digits than its factorization.

209293934640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52900 (or 52894 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 51.

The spelling of 209293934640 in words is "two hundred nine billion, two hundred ninety-three million, nine hundred thirty-four thousand, six hundred forty".