1688805745 has 8 divisors (see below), whose sum is σ = 2210800320. Its totient is φ = 1228222320.

The previous prime is 1688805743. The next prime is 1688805761. The reversal of 1688805745 is 5475088861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1688805745 - 2¹ = 1688805743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1688805692 and 1688805701.

It is not an unprimeable number, because it can be changed into a prime (1688805743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15352725 + ... + 15352834.

It is an arithmetic number, because the mean of its divisors is an integer number (276350040).

Almost surely, 2^1688805745 is an apocalyptic number.

It is an amenable number.

1688805745 is a deficient number, since it is larger than the sum of its proper divisors (521994575).

1688805745 is a wasteful number, since it uses less digits than its factorization.

1688805745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30705575.

The product of its (nonzero) digits is 2150400, while the sum is 52.

The square root of 1688805745 is about 41095.0817616902. The cubic root of 1688805745 is about 1190.8577825472.

The spelling of 1688805745 in words is "one billion, six hundred eighty-eight million, eight hundred five thousand, seven hundred forty-five".