1720735680 has 56 divisors (see below), whose sum is σ = 5463338832. Its totient is φ = 458862592.

The previous prime is 1720735669. The next prime is 1720735711. The reversal of 1720735680 is 865370271.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 895257 + ... + 897176.

It is an arithmetic number, because the mean of its divisors is an integer number (97559622).

Almost surely, 2^1720735680 is an apocalyptic number.

1720735680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720735680 is an abundant number, since it is smaller than the sum of its proper divisors (3742603152).

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

1720735680 is a wasteful number, since it uses less digits than its factorization.

1720735680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792453 (or 1792443 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 1720735680 is about 41481.7511684355. The cubic root of 1720735680 is about 1198.3160825681.

The spelling of 1720735680 in words is "one billion, seven hundred twenty million, seven hundred thirty-five thousand, six hundred eighty".