1720066684 has 48 divisors (see below), whose sum is σ = 3635251200. Its totient is φ = 696174336.

The previous prime is 1720066639. The next prime is 1720066709. The reversal of 1720066684 is 4866600271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33972 + ... + 67780.

It is an arithmetic number, because the mean of its divisors is an integer number (75734400).

Almost surely, 2^1720066684 is an apocalyptic number.

1720066684 is a gapful number since it is divisible by the number (14) 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 1720066684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1817625600).

1720066684 is an abundant number, since it is smaller than the sum of its proper divisors (1915184516).

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

1720066684 is a wasteful number, since it uses less digits than its factorization.

1720066684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33922 (or 33920 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1720066684 is about 41473.6866458722. The cubic root of 1720066684 is about 1198.1607667169.

The spelling of 1720066684 in words is "one billion, seven hundred twenty million, sixty-six thousand, six hundred eighty-four".