1689505887 has 8 divisors (see below), whose sum is σ = 2290855680. Its totient is φ = 1107246680.

The previous prime is 1689505861. The next prime is 1689505891. The reversal of 1689505887 is 7885059861.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1689505887 - 2¹¹ = 1689503839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689505817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4772439 + ... + 4772792.

It is an arithmetic number, because the mean of its divisors is an integer number (286356960).

Almost surely, 2^1689505887 is an apocalyptic number.

1689505887 is a deficient number, since it is larger than the sum of its proper divisors (601349793).

1689505887 is an equidigital number, since it uses as much as digits as its factorization.

1689505887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9545293.

The product of its (nonzero) digits is 4838400, while the sum is 57.

The square root of 1689505887 is about 41103.5994409249. The cubic root of 1689505887 is about 1191.0223276916.

The spelling of 1689505887 in words is "one billion, six hundred eighty-nine million, five hundred five thousand, eight hundred eighty-seven".