6281720664 has 32 divisors (see below), whose sum is σ = 15919433520. Its totient is φ = 2065222656.

The previous prime is 6281720639. The next prime is 6281720707. The reversal of 6281720664 is 4660271826.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1790977 + ... + 1794480.

Almost surely, 2^6281720664 is an apocalyptic number.

It is an amenable number.

6281720664 is an abundant number, since it is smaller than the sum of its proper divisors (9637712856).

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

6281720664 is a wasteful number, since it uses less digits than its factorization.

6281720664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3585539 (or 3585535 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 6281720664 is about 79257.3066915600. The cubic root of 6281720664 is about 1845.1267568115.

The spelling of 6281720664 in words is "six billion, two hundred eighty-one million, seven hundred twenty thousand, six hundred sixty-four".