9999668 has 12 divisors (see below), whose sum is σ = 19999392.
Its totient is φ = 4285560.
The previous prime is 9999667. The next prime is 9999677. The reversal of 9999668 is 8669999.
9999668 is an admirable number.
It is a super-2 number, since 2×99996682 = 199986720220448, which contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9999667) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178538 + ... + 178593.
It is an arithmetic number, because the mean of its divisors is an integer number (1666616).
Almost surely, 29999668 is an apocalyptic number.
It is an amenable number.
9999668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
9999668 is a wasteful number, since it uses less digits than its factorization.
9999668 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 357142 (or 357140 counting only the distinct ones).
The product of its digits is 1889568, while the sum is 56.
The square root of 9999668 is about 3162.2251659235.
The cubic root of 9999668 is about 215.4410847357.
The spelling of 9999668 in words is "nine million, nine hundred ninety-nine thousand, six hundred sixty-eight".