1720839664 has 20 divisors (see below), whose sum is σ = 3374299656. Its totient is φ = 850052672.

The previous prime is 1720839649. The next prime is 1720839683. The reversal of 1720839664 is 4669380271.

It is a super-2 number, since 2×1720839664² = 5922578298391265792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 646579 + ... + 649234.

Almost surely, 2^1720839664 is an apocalyptic number.

It is an amenable number.

1720839664 is a deficient number, since it is larger than the sum of its proper divisors (1653459992).

1720839664 is a wasteful number, since it uses less digits than its factorization.

1720839664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295904 (or 1295898 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 1720839664 is about 41483.0045199236. The cubic root of 1720839664 is about 1198.3402201490.

The spelling of 1720839664 in words is "one billion, seven hundred twenty million, eight hundred thirty-nine thousand, six hundred sixty-four".