641004500 has 24 divisors (see below), whose sum is σ = 1399954920. Its totient is φ = 256401600.

The previous prime is 641004473. The next prime is 641004521. The reversal of 641004500 is 5400146.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2835856 + 638168644 = 1684^2 + 25262^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 640505 + ... + 641504.

It is an arithmetic number, because the mean of its divisors is an integer number (58331455).

Almost surely, 2^641004500 is an apocalyptic number.

It is an amenable number.

641004500 is an abundant number, since it is smaller than the sum of its proper divisors (758950420).

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

641004500 is a wasteful number, since it uses less digits than its factorization.

641004500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282028 (or 1282016 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 641004500 is about 25318.0666718452. The cubic root of 641004500 is about 862.2245006814.

Adding to 641004500 its reverse (5400146), we get a palindrome (646404646).

The spelling of 641004500 in words is "six hundred forty-one million, four thousand, five hundred".