1720449936 has 80 divisors (see below), whose sum is σ = 4944475200. Its totient is φ = 572769792.

The previous prime is 1720449877. The next prime is 1720449937. The reversal of 1720449936 is 6399440271.

It is a happy number.

1720449936 is a `hidden beast` number, since 172 + 0 + 449 + 9 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1720449891 and 1720449900.

It is not an unprimeable number, because it can be changed into a prime (1720449937) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 433915 + ... + 437861.

It is an arithmetic number, because the mean of its divisors is an integer number (61805940).

Almost surely, 2^1720449936 is an apocalyptic number.

1720449936 is a gapful number since it is divisible by the number (16) 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 1720449936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2472237600).

1720449936 is an abundant number, since it is smaller than the sum of its proper divisors (3224025264).

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

1720449936 is a wasteful number, since it uses less digits than its factorization.

1720449936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4973 (or 4961 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1720449936 is about 41478.3068121157. The cubic root of 1720449936 is about 1198.2497484240.

The spelling of 1720449936 in words is "one billion, seven hundred twenty million, four hundred forty-nine thousand, nine hundred thirty-six".