1688989898 has 8 divisors (see below), whose sum is σ = 2533659492. Its totient is φ = 844436736.

The previous prime is 1688989877. The next prime is 1688989903. The reversal of 1688989898 is 8989898861.

It can be written as a sum of positive squares in 2 ways, for example, as 1512976609 + 176013289 = 38897^2 + 13267^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39536 + ... + 70292.

Almost surely, 2^1688989898 is an apocalyptic number.

1688989898 is a deficient number, since it is larger than the sum of its proper divisors (844669594).

1688989898 is a wasteful number, since it uses less digits than its factorization.

1688989898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58216.

The product of its digits is 143327232, while the sum is 74.

The square root of 1688989898 is about 41097.3222728683. The cubic root of 1688989898 is about 1190.9010660062.

The spelling of 1688989898 in words is "one billion, six hundred eighty-eight million, nine hundred eighty-nine thousand, eight hundred ninety-eight".