641682686 has 4 divisors (see below), whose sum is σ = 962524032. Its totient is φ = 320841342.

The previous prime is 641682683. The next prime is 641682689. The reversal of 641682686 is 686286146.

It is a happy number.

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 (641682683) and next prime (641682689).

It is a self number, because there is not a number n which added to its sum of digits gives 641682686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641682683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160420670 + ... + 160420673.

It is an arithmetic number, because the mean of its divisors is an integer number (240631008).

Almost surely, 2^641682686 is an apocalyptic number.

641682686 is a deficient number, since it is larger than the sum of its proper divisors (320841346).

641682686 is a wasteful number, since it uses less digits than its factorization.

641682686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320841345.

The product of its digits is 663552, while the sum is 47.

The square root of 641682686 is about 25331.4564524032. The cubic root of 641682686 is about 862.5284727981.

The spelling of 641682686 in words is "six hundred forty-one million, six hundred eighty-two thousand, six hundred eighty-six".