1720689135 has 16 divisors (see below), whose sum is σ = 3003384960. Its totient is φ = 834273440.

The previous prime is 1720689127. The next prime is 1720689137. The reversal of 1720689135 is 5319860271.

It is not a de Polignac number, because 1720689135 - 2³ = 1720689127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720689137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5214045 + ... + 5214374.

It is an arithmetic number, because the mean of its divisors is an integer number (187711560).

Almost surely, 2^1720689135 is an apocalyptic number.

1720689135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1720689135 is a deficient number, since it is larger than the sum of its proper divisors (1282695825).

1720689135 is a wasteful number, since it uses less digits than its factorization.

1720689135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10428438.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 1720689135 is about 41481.1901348069. The cubic root of 1720689135 is about 1198.3052778630.

The spelling of 1720689135 in words is "one billion, seven hundred twenty million, six hundred eighty-nine thousand, one hundred thirty-five".