1688420008 has 32 divisors (see below), whose sum is σ = 3656741760. Its totient is φ = 722318080.

The previous prime is 1688419987. The next prime is 1688420017. The reversal of 1688420008 is 8000248861.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562816 + ... + 565807.

It is an arithmetic number, because the mean of its divisors is an integer number (114273180).

Almost surely, 2^1688420008 is an apocalyptic number.

It is an amenable number.

1688420008 is an abundant number, since it is smaller than the sum of its proper divisors (1968321752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1688420008 is a wasteful number, since it uses less digits than its factorization.

1688420008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128657 (or 1128653 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 1688420008 is about 41090.3882678176. The cubic root of 1688420008 is about 1190.7671084347.

Adding to 1688420008 its reverse (8000248861), we get a palindrome (9688668869).

The spelling of 1688420008 in words is "one billion, six hundred eighty-eight million, four hundred twenty thousand, eight".