641982789 has 24 divisors (see below), whose sum is σ = 1064203712. Its totient is φ = 365316480.

The previous prime is 641982787. The next prime is 641982833. The reversal of 641982789 is 987289146.

It is not a de Polignac number, because 641982789 - 2¹ = 641982787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641982787) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5959 + ... + 36324.

Almost surely, 2^641982789 is an apocalyptic number.

It is an amenable number.

641982789 is a deficient number, since it is larger than the sum of its proper divisors (422220923).

641982789 is a wasteful number, since it uses less digits than its factorization.

641982789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42537 (or 42534 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 641982789 is about 25337.3792843696. The cubic root of 641982789 is about 862.6629146573.

The spelling of 641982789 in words is "six hundred forty-one million, nine hundred eighty-two thousand, seven hundred eighty-nine".