1720128916 has 24 divisors (see below), whose sum is σ = 3288388320. Its totient is φ = 780804000.

The previous prime is 1720128913. The next prime is 1720128929. The reversal of 1720128916 is 6198210271.

It is a super-3 number, since 3×1720128916³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720128913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6066 + ... + 58966.

It is an arithmetic number, because the mean of its divisors is an integer number (137016180).

Almost surely, 2^1720128916 is an apocalyptic number.

It is an amenable number.

1720128916 is a deficient number, since it is larger than the sum of its proper divisors (1568259404).

1720128916 is a wasteful number, since it uses less digits than its factorization.

1720128916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53655 (or 53653 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1720128916 is about 41474.4368979254. The cubic root of 1720128916 is about 1198.1752163586.

The spelling of 1720128916 in words is "one billion, seven hundred twenty million, one hundred twenty-eight thousand, nine hundred sixteen".