641728337 has 4 divisors (see below), whose sum is σ = 641814180. Its totient is φ = 641642496.

The previous prime is 641728331. The next prime is 641728343. The reversal of 641728337 is 733827146.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (641728331) and next prime (641728343).

It can be written as a sum of positive squares in 2 ways, for example, as 394578496 + 247149841 = 19864^2 + 15721^2 .

It is a cyclic number.

It is not a de Polignac number, because 641728337 - 2⁶ = 641728273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641728294 and 641728303.

It is not an unprimeable number, because it can be changed into a prime (641728331) 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, 30512 + ... + 47057.

It is an arithmetic number, because the mean of its divisors is an integer number (160453545).

Almost surely, 2^641728337 is an apocalyptic number.

It is an amenable number.

641728337 is a deficient number, since it is larger than the sum of its proper divisors (85843).

641728337 is an equidigital number, since it uses as much as digits as its factorization.

641728337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85842.

The product of its digits is 169344, while the sum is 41.

The square root of 641728337 is about 25332.3575097147. The cubic root of 641728337 is about 862.5489264971.

The spelling of 641728337 in words is "six hundred forty-one million, seven hundred twenty-eight thousand, three hundred thirty-seven".