1720699680 has 288 divisors, whose sum is σ = 6360379200. Its totient is φ = 389867520.

The previous prime is 1720699663. The next prime is 1720699691. The reversal of 1720699680 is 869960271.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3504235 + ... + 3504725.

It is an arithmetic number, because the mean of its divisors is an integer number (22084650).

Almost surely, 2^1720699680 is an apocalyptic number.

1720699680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1720699680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3180189600).

1720699680 is an abundant number, since it is smaller than the sum of its proper divisors (4639679520).

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

1720699680 is a wasteful number, since it uses less digits than its factorization.

1720699680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 1720699680 is about 41481.3172404156. The cubic root of 1720699680 is about 1198.3077257395.

It can be divided in two parts, 17206 and 99680, that added together give a triangular number (116886 = T₄₈₃).

The spelling of 1720699680 in words is "one billion, seven hundred twenty million, six hundred ninety-nine thousand, six hundred eighty".