640715600 has 120 divisors (see below), whose sum is σ = 1835894400. Its totient is φ = 210101760.

The previous prime is 640715599. The next prime is 640715617. The reversal of 640715600 is 6517046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59426 + ... + 69374.

It is an arithmetic number, because the mean of its divisors is an integer number (15299120).

Almost surely, 2^640715600 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 640715600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917947200).

640715600 is an abundant number, since it is smaller than the sum of its proper divisors (1195178800).

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

640715600 is a wasteful number, since it uses less digits than its factorization.

640715600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9997 (or 9986 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 640715600 is about 25312.3606169002. The cubic root of 640715600 is about 862.0949466818.

The spelling of 640715600 in words is "six hundred forty million, seven hundred fifteen thousand, six hundred".