640196369800 has 288 divisors, whose sum is σ = 1678786836480. Its totient is φ = 226688716800.

The previous prime is 640196369777. The next prime is 640196369803. The reversal of 640196369800 is 8963691046.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (640196369803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 118398697 + ... + 118404103.

It is an arithmetic number, because the mean of its divisors is an integer number (5829120960).

Almost surely, 2^640196369800 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640196369800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839393418240).

640196369800 is an abundant number, since it is smaller than the sum of its proper divisors (1038590466680).

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

640196369800 is a wasteful number, since it uses less digits than its factorization.

640196369800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5593 (or 5571 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 640196369800 in words is "six hundred forty billion, one hundred ninety-six million, three hundred sixty-nine thousand, eight hundred".