641935842 has 16 divisors (see below), whose sum is σ = 1339692480. Its totient is φ = 204675152.

The previous prime is 641935813. The next prime is 641935849. The reversal of 641935842 is 248539146.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 641935794 and 641935803.

It is not an unprimeable number, because it can be changed into a prime (641935849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2325717 + ... + 2325992.

It is an arithmetic number, because the mean of its divisors is an integer number (83730780).

Almost surely, 2^641935842 is an apocalyptic number.

641935842 is an abundant number, since it is smaller than the sum of its proper divisors (697756638).

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

641935842 is a wasteful number, since it uses less digits than its factorization.

641935842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4651737.

The product of its digits is 207360, while the sum is 42.

The square root of 641935842 is about 25336.4528298655. The cubic root of 641935842 is about 862.6418858365.

The spelling of 641935842 in words is "six hundred forty-one million, nine hundred thirty-five thousand, eight hundred forty-two".