640547600 has 180 divisors, whose sum is σ = 1953566928. Its totient is φ = 199584000.

The previous prime is 640547599. The next prime is 640547617. The reversal of 640547600 is 6745046.

640547600 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 214115 + ... + 217085.

Almost surely, 2^640547600 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 640547600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976783464).

640547600 is an abundant number, since it is smaller than the sum of its proper divisors (1313019328).

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

640547600 is a wasteful number, since it uses less digits than its factorization.

640547600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014 (or 2996 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 640547600 is about 25309.0418625439. The cubic root of 640547600 is about 862.0195910370.

The spelling of 640547600 in words is "six hundred forty million, five hundred forty-seven thousand, six hundred".