1720870272 has 320 divisors, whose sum is σ = 5687193600. Its totient is φ = 512179200.

The previous prime is 1720870253. The next prime is 1720870313. The reversal of 1720870272 is 2720780271.

It is a super-2 number, since 2×1720870272² = 5922788986106707968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9009697 + ... + 9009887.

It is an arithmetic number, because the mean of its divisors is an integer number (17772480).

Almost surely, 2^1720870272 is an apocalyptic number.

1720870272 is a gapful number since it is divisible by the number (12) 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 1720870272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2843596800).

1720870272 is an abundant number, since it is smaller than the sum of its proper divisors (3966323328).

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

1720870272 is a wasteful number, since it uses less digits than its factorization.

1720870272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 1720870272 is about 41483.3734404520. The cubic root of 1720870272 is about 1198.3473249325.

Subtracting 1720870272 from its reverse (2720780271), we obtain a palindrome (999909999).

The spelling of 1720870272 in words is "one billion, seven hundred twenty million, eight hundred seventy thousand, two hundred seventy-two".