640034729600 has 768 divisors, whose sum is σ = 1983206400000. Its totient is φ = 199165132800.

The previous prime is 640034729591. The next prime is 640034729603. The reversal of 640034729600 is 6927430046.

It is not an unprimeable number, because it can be changed into a prime (640034729603) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1833910226 + ... + 1833910574.

It is an arithmetic number, because the mean of its divisors is an integer number (2582300000).

Almost surely, 2^640034729600 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 640034729600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991603200000).

640034729600 is an abundant number, since it is smaller than the sum of its proper divisors (1343171670400).

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

640034729600 is a wasteful number, since it uses less digits than its factorization.

640034729600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The spelling of 640034729600 in words is "six hundred forty billion, thirty-four million, seven hundred twenty-nine thousand, six hundred".