641775020 has 36 divisors (see below), whose sum is σ = 1392646752. Its totient is φ = 248421600.

The previous prime is 641774983. The next prime is 641775073. The reversal of 641775020 is 20577146.

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 11 ways as a sum of consecutive naturals, for example, 2525 + ... + 35915.

It is an arithmetic number, because the mean of its divisors is an integer number (38684632).

Almost surely, 2^641775020 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 641775020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (696323376).

641775020 is an abundant number, since it is smaller than the sum of its proper divisors (750871732).

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

641775020 is a wasteful number, since it uses less digits than its factorization.

641775020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33462 (or 33429 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 641775020 is about 25333.2789034503. The cubic root of 641775020 is about 862.5698415753.

The spelling of 641775020 in words is "six hundred forty-one million, seven hundred seventy-five thousand, twenty".