6440789932 has 12 divisors (see below), whose sum is σ = 11934405000. Its totient is φ = 3030959936.

The previous prime is 6440789909. The next prime is 6440789941. The reversal of 6440789932 is 2399870446.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440789932.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47358682 + ... + 47358817.

It is an arithmetic number, because the mean of its divisors is an integer number (994533750).

Almost surely, 2^6440789932 is an apocalyptic number.

It is an amenable number.

6440789932 is a deficient number, since it is larger than the sum of its proper divisors (5493615068).

6440789932 is a wasteful number, since it uses less digits than its factorization.

6440789932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94717520 (or 94717518 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 52.

The square root of 6440789932 is about 80254.5321586264. The cubic root of 6440789932 is about 1860.5715601932.

The spelling of 6440789932 in words is "six billion, four hundred forty million, seven hundred eighty-nine thousand, nine hundred thirty-two".