641660682 has 32 divisors (see below), whose sum is σ = 1463337792. Its totient is φ = 185819904.

The previous prime is 641660659. The next prime is 641660687. The reversal of 641660682 is 286066146.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 641660682.

It is not an unprimeable number, because it can be changed into a prime (641660687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240628 + ... + 243279.

It is an arithmetic number, because the mean of its divisors is an integer number (45729306).

Almost surely, 2^641660682 is an apocalyptic number.

641660682 is an abundant number, since it is smaller than the sum of its proper divisors (821677110).

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

641660682 is a wasteful number, since it uses less digits than its factorization.

641660682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483942.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 641660682 is about 25331.0221270284. The cubic root of 641660682 is about 862.5186136710.

The spelling of 641660682 in words is "six hundred forty-one million, six hundred sixty thousand, six hundred eighty-two".