641756048 has 40 divisors (see below), whose sum is σ = 1310868480. Its totient is φ = 303909120.

The previous prime is 641756033. The next prime is 641756077. The reversal of 641756048 is 840657146.

It is a junction number, because it is equal to n+sod(n) for n = 641755996 and 641756014.

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 7 ways as a sum of consecutive naturals, for example, 9548 + ... + 37076.

It is an arithmetic number, because the mean of its divisors is an integer number (32771712).

Almost surely, 2^641756048 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 641756048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (655434240).

641756048 is an abundant number, since it is smaller than the sum of its proper divisors (669112432).

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

641756048 is a wasteful number, since it uses less digits than its factorization.

641756048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27615 (or 27609 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 641756048 is about 25332.9044525100. The cubic root of 641756048 is about 862.5613417970.

The spelling of 641756048 in words is "six hundred forty-one million, seven hundred fifty-six thousand, forty-eight".