641725588 has 48 divisors (see below), whose sum is σ = 1363388544. Its totient is φ = 258001920.

The previous prime is 641725583. The next prime is 641725603. The reversal of 641725588 is 885527146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641725583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155520 + ... + 159592.

It is an arithmetic number, because the mean of its divisors is an integer number (28403928).

Almost surely, 2^641725588 is an apocalyptic number.

641725588 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641725588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681694272).

641725588 is an abundant number, since it is smaller than the sum of its proper divisors (721662956).

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

641725588 is a wasteful number, since it uses less digits than its factorization.

641725588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4432 (or 4430 counting only the distinct ones).

The product of its digits is 537600, while the sum is 46.

The square root of 641725588 is about 25332.3032509877. The cubic root of 641725588 is about 862.5476948490.

The spelling of 641725588 in words is "six hundred forty-one million, seven hundred twenty-five thousand, five hundred eighty-eight".