641533448 has 8 divisors (see below), whose sum is σ = 1202875230. Its totient is φ = 320766720.

The previous prime is 641533441. The next prime is 641533463. The reversal of 641533448 is 844335146.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 464057764 + 177475684 = 21542^2 + 13322^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (641533441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40095833 + ... + 40095848.

Almost surely, 2^641533448 is an apocalyptic number.

It is an amenable number.

641533448 is a deficient number, since it is larger than the sum of its proper divisors (561341782).

641533448 is a wasteful number, since it uses less digits than its factorization.

641533448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80191687 (or 80191683 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 641533448 is about 25328.5105760287. The cubic root of 641533448 is about 862.4616006989.

The spelling of 641533448 in words is "six hundred forty-one million, five hundred thirty-three thousand, four hundred forty-eight".