641204442 has 48 divisors (see below), whose sum is σ = 1499696640. Its totient is φ = 197388576.

The previous prime is 641204411. The next prime is 641204449. The reversal of 641204442 is 244402146.

It is a happy number.

It is a super-2 number, since 2×641204442² = 822286272881062728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641204449) 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 in 23 ways as a sum of consecutive naturals, for example, 14698 + ... + 38709.

It is an arithmetic number, because the mean of its divisors is an integer number (31243680).

Almost surely, 2^641204442 is an apocalyptic number.

641204442 is an abundant number, since it is smaller than the sum of its proper divisors (858492198).

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

641204442 is a wasteful number, since it uses less digits than its factorization.

641204442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53467 (or 53464 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 641204442 is about 25322.0149672178. The cubic root of 641204442 is about 862.3141396619.

Adding to 641204442 its reverse (244402146), we get a palindrome (885606588).

The spelling of 641204442 in words is "six hundred forty-one million, two hundred four thousand, four hundred forty-two".