1720440000 has 490 divisors, whose sum is σ = 6504683460. Its totient is φ = 451008000.

The previous prime is 1720439999. The next prime is 1720440031. The reversal of 1720440000 is 440271.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 69 ways as a sum of consecutive naturals, for example, 29159971 + ... + 29160029.

Almost surely, 2^1720440000 is an apocalyptic number.

1720440000 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 1720440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3252341730).

1720440000 is an abundant number, since it is smaller than the sum of its proper divisors (4784243460).

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

1720440000 is an frugal number, since it uses more digits than its factorization.

1720440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 1720440000 is about 41478.1870384905. The cubic root of 1720440000 is about 1198.2474416955.

Adding to 1720440000 its reverse (440271), we get a palindrome (1720880271).

The spelling of 1720440000 in words is "one billion, seven hundred twenty million, four hundred forty thousand".