641642444 has 12 divisors (see below), whose sum is σ = 1123067568. Its totient is φ = 320766000.

The previous prime is 641642423. The next prime is 641642447. The reversal of 641642444 is 444246146.

It is not an unprimeable number, because it can be changed into a prime (641642447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23594 + ... + 42894.

It is an arithmetic number, because the mean of its divisors is an integer number (93588964).

Almost surely, 2^641642444 is an apocalyptic number.

It is an amenable number.

641642444 is a deficient number, since it is larger than the sum of its proper divisors (481425124).

641642444 is a wasteful number, since it uses less digits than its factorization.

641642444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27616 (or 27614 counting only the distinct ones).

The product of its digits is 73728, while the sum is 35.

The square root of 641642444 is about 25330.6621311011. The cubic root of 641642444 is about 862.5104417695.

The spelling of 641642444 in words is "six hundred forty-one million, six hundred forty-two thousand, four hundred forty-four".