641393536 has 80 divisors (see below), whose sum is σ = 1491364440. Its totient is φ = 274751232.

The previous prime is 641393509. The next prime is 641393573. The reversal of 641393536 is 635393146.

It is a super-2 number, since 2×641393536² = 822771336045166592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 306285 + ... + 308371.

Almost surely, 2^641393536 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 641393536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745682220).

641393536 is an abundant number, since it is smaller than the sum of its proper divisors (849970904).

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

641393536 is an frugal number, since it uses more digits than its factorization.

641393536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129 (or 2096 counting only the distinct ones).

The product of its digits is 174960, while the sum is 40.

The square root of 641393536 is about 25325.7484785741. The cubic root of 641393536 is about 862.3988980702.

The spelling of 641393536 in words is "six hundred forty-one million, three hundred ninety-three thousand, five hundred thirty-six".