1689638602 has 16 divisors (see below), whose sum is σ = 2707297992. Its totient is φ = 788085760.

The previous prime is 1689638591. The next prime is 1689638609. The reversal of 1689638602 is 2068369861.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1386147361 + 303491241 = 37231^2 + 17421^2 .

It is not an unprimeable number, because it can be changed into a prime (1689638609) 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, 216049 + ... + 223732.

Almost surely, 2^1689638602 is an apocalyptic number.

1689638602 is a deficient number, since it is larger than the sum of its proper divisors (1017659390).

1689638602 is a wasteful number, since it uses less digits than its factorization.

1689638602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439913.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 1689638602 is about 41105.2138055503. The cubic root of 1689638602 is about 1191.0535128230.

The spelling of 1689638602 in words is "one billion, six hundred eighty-nine million, six hundred thirty-eight thousand, six hundred two".