641795526 has 96 divisors (see below), whose sum is σ = 1509580800. Its totient is φ = 196335360.

The previous prime is 641795521. The next prime is 641795537. The reversal of 641795526 is 625597146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641795521) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 3360091 + ... + 3360281.

It is an arithmetic number, because the mean of its divisors is an integer number (15724800).

Almost surely, 2^641795526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641795526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (754790400).

641795526 is an abundant number, since it is smaller than the sum of its proper divisors (867785274).

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

641795526 is a wasteful number, since it uses less digits than its factorization.

641795526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 431 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 641795526 is about 25333.6836247712. The cubic root of 641795526 is about 862.5790284234.

The spelling of 641795526 in words is "six hundred forty-one million, seven hundred ninety-five thousand, five hundred twenty-six".