641738216 has 32 divisors (see below), whose sum is σ = 1422576000. Its totient is φ = 265546176.

The previous prime is 641738213. The next prime is 641738231. The reversal of 641738216 is 612837146.

It is a self number, because there is not a number n which added to its sum of digits gives 641738216.

It is not an unprimeable number, because it can be changed into a prime (641738213) 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 7 ways as a sum of consecutive naturals, for example, 195956 + ... + 199203.

It is an arithmetic number, because the mean of its divisors is an integer number (44455500).

Almost surely, 2^641738216 is an apocalyptic number.

It is an amenable number.

641738216 is an abundant number, since it is smaller than the sum of its proper divisors (780837784).

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

641738216 is a wasteful number, since it uses less digits than its factorization.

641738216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395201 (or 395197 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 641738216 is about 25332.5524967383. The cubic root of 641738216 is about 862.5533526053.

The spelling of 641738216 in words is "six hundred forty-one million, seven hundred thirty-eight thousand, two hundred sixteen".