640186848 has 192 divisors, whose sum is σ = 2151152640. Its totient is φ = 181440000.

The previous prime is 640186847. The next prime is 640186873. The reversal of 640186848 is 848681046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640186847) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 912898 + ... + 913598.

It is an arithmetic number, because the mean of its divisors is an integer number (11203920).

Almost surely, 2^640186848 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 640186848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1075576320).

640186848 is an abundant number, since it is smaller than the sum of its proper divisors (1510965792).

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

640186848 is a wasteful number, since it uses less digits than its factorization.

640186848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 864 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The square root of 640186848 is about 25301.9139197018. The cubic root of 640186848 is about 861.8577328137.

The spelling of 640186848 in words is "six hundred forty million, one hundred eighty-six thousand, eight hundred forty-eight".