641728351 has 16 divisors (see below), whose sum is σ = 718502400. Its totient is φ = 568081600.

The previous prime is 641728343. The next prime is 641728369. The reversal of 641728351 is 153827146.

It is a cyclic number.

It is not a de Polignac number, because 641728351 - 2³ = 641728343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641728351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641728301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323280 + ... + 325258.

It is an arithmetic number, because the mean of its divisors is an integer number (44906400).

Almost surely, 2^641728351 is an apocalyptic number.

641728351 is a deficient number, since it is larger than the sum of its proper divisors (76774049).

641728351 is a wasteful number, since it uses less digits than its factorization.

641728351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750.

The product of its digits is 40320, while the sum is 37.

The square root of 641728351 is about 25332.3577860412. The cubic root of 641728351 is about 862.5489327696.

The spelling of 641728351 in words is "six hundred forty-one million, seven hundred twenty-eight thousand, three hundred fifty-one".