1687470869 has 12 divisors (see below), whose sum is σ = 2000016684. Its totient is φ = 1419110784.

The previous prime is 1687470839. The next prime is 1687470871. The reversal of 1687470869 is 9680747861.

It can be written as a sum of positive squares in 2 ways, for example, as 955119025 + 732351844 = 30905^2 + 27062^2 .

It is not a de Polignac number, because 1687470869 - 2²⁴ = 1670693653 is a prime.

It is a super-2 number, since 2×1687470869² = 5695115867447230322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687470809) 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 11 ways as a sum of consecutive naturals, for example, 322292 + ... + 327485.

It is an arithmetic number, because the mean of its divisors is an integer number (166668057).

Almost surely, 2^1687470869 is an apocalyptic number.

It is an amenable number.

1687470869 is a deficient number, since it is larger than the sum of its proper divisors (312545815).

1687470869 is an equidigital number, since it uses as much as digits as its factorization.

1687470869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649844 (or 649837 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 56.

The square root of 1687470869 is about 41078.8372401167. The cubic root of 1687470869 is about 1190.5439381841.

The spelling of 1687470869 in words is "one billion, six hundred eighty-seven million, four hundred seventy thousand, eight hundred sixty-nine".