641854340 has 12 divisors (see below), whose sum is σ = 1347894156. Its totient is φ = 256741728.

The previous prime is 641854321. The next prime is 641854379. The reversal of 641854340 is 43458146.

It can be written as a sum of positive squares in 2 ways, for example, as 493550656 + 148303684 = 22216^2 + 12178^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 641854340.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 16046339 + ... + 16046378.

It is an arithmetic number, because the mean of its divisors is an integer number (112324513).

Almost surely, 2^641854340 is an apocalyptic number.

It is an amenable number.

641854340 is an abundant number, since it is smaller than the sum of its proper divisors (706039816).

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

641854340 is a wasteful number, since it uses less digits than its factorization.

641854340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32092726 (or 32092724 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 641854340 is about 25334.8443847599. The cubic root of 641854340 is about 862.6053764690.

The spelling of 641854340 in words is "six hundred forty-one million, eight hundred fifty-four thousand, three hundred forty".