641820536 has 32 divisors (see below), whose sum is σ = 1377171840. Its totient is φ = 274697568.

The previous prime is 641820493. The next prime is 641820577. The reversal of 641820536 is 635028146.

It is a junction number, because it is equal to n+sod(n) for n = 641820496 and 641820505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36791 + ... + 51353.

It is an arithmetic number, because the mean of its divisors is an integer number (43036620).

Almost surely, 2^641820536 is an apocalyptic number.

It is an amenable number.

641820536 is an abundant number, since it is smaller than the sum of its proper divisors (735351304).

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

641820536 is a wasteful number, since it uses less digits than its factorization.

641820536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15363 (or 15359 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 641820536 is about 25334.1772315582. The cubic root of 641820536 is about 862.5902328337.

The spelling of 641820536 in words is "six hundred forty-one million, eight hundred twenty thousand, five hundred thirty-six".