641169536 has 64 divisors (see below), whose sum is σ = 1483863360. Its totient is φ = 270259200.

The previous prime is 641169509. The next prime is 641169539. The reversal of 641169536 is 635961146.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×641169536² = 822196747788910592, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 641169493 and 641169502.

It is not an unprimeable number, because it can be changed into a prime (641169539) 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 7 ways as a sum of consecutive naturals, for example, 48791 + ... + 60521.

It is an arithmetic number, because the mean of its divisors is an integer number (23185365).

Almost surely, 2^641169536 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 641169536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741931680).

641169536 is an abundant number, since it is smaller than the sum of its proper divisors (842693824).

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

641169536 is a wasteful number, since it uses less digits than its factorization.

641169536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11813 (or 11801 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The square root of 641169536 is about 25321.3257156887. The cubic root of 641169536 is about 862.2984917751.

The spelling of 641169536 in words is "six hundred forty-one million, one hundred sixty-nine thousand, five hundred thirty-six".