999980688 has 40 divisors (see below), whose sum is σ = 2952324928. Its totient is φ = 285708672.

The previous prime is 999980677. The next prime is 999980689. The reversal of 999980688 is 886089999.

It is a super-2 number, since 2×999980688² = 1999922752745906688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999980689) 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, 1487731 + ... + 1488402.

Almost surely, 2^999980688 is an apocalyptic number.

It is an amenable number.

999980688 is an abundant number, since it is smaller than the sum of its proper divisors (1952344240).

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

999980688 is a wasteful number, since it uses less digits than its factorization.

999980688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976151 (or 2976145 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 66.

The square root of 999980688 is about 31622.4712506787. The cubic root of 999980688 is about 999.9935626252.

The spelling of 999980688 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, six hundred eighty-eight".