641804427 has 24 divisors (see below), whose sum is σ = 1012639680. Its totient is φ = 388468080.

The previous prime is 641804357. The next prime is 641804437. The reversal of 641804427 is 724408146.

641804427 is a `hidden beast` number, since 641 + 8 + 0 + 4 + 4 + 2 + 7 = 666.

It is not a de Polignac number, because 641804427 - 2¹² = 641800331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 641804391 and 641804400.

It is not an unprimeable number, because it can be changed into a prime (641804437) 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, 81268 + ... + 88814.

It is an arithmetic number, because the mean of its divisors is an integer number (42193320).

Almost surely, 2^641804427 is an apocalyptic number.

641804427 is a deficient number, since it is larger than the sum of its proper divisors (370835253).

641804427 is a wasteful number, since it uses less digits than its factorization.

641804427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8423 (or 8420 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 641804427 is about 25333.8592993646. The cubic root of 641804427 is about 862.5830160800.

The spelling of 641804427 in words is "six hundred forty-one million, eight hundred four thousand, four hundred twenty-seven".