641773000 has 128 divisors (see below), whose sum is σ = 1679408640. Its totient is φ = 227520000.

The previous prime is 641772977. The next prime is 641773021. The reversal of 641773000 is 377146.

It is a self number, because there is not a number n which added to its sum of digits gives 641773000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 450289 + ... + 451711.

It is an arithmetic number, because the mean of its divisors is an integer number (13120380).

Almost surely, 2^641773000 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 641773000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839704320).

641773000 is an abundant number, since it is smaller than the sum of its proper divisors (1037635640).

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

641773000 is a wasteful number, since it uses less digits than its factorization.

641773000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 641773000 is about 25333.2390349122. The cubic root of 641773000 is about 862.5689365890.

The spelling of 641773000 in words is "six hundred forty-one million, seven hundred seventy-three thousand".