9999680 has 28 divisors (see below), whose sum is σ = 23812500. Its totient is φ = 3999744.

The previous prime is 9999677. The next prime is 9999713. The reversal of 9999680 is 869999.

It can be written as a sum of positive squares in 2 ways, for example, as 5053504 + 4946176 = 2248^2 + 2224^2 .

It is a congruent 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, 15305 + ... + 15944.

Almost surely, 2^9999680 is an apocalyptic number.

It is an amenable number.

9999680 is an abundant number, since it is smaller than the sum of its proper divisors (13812820).

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

9999680 is a wasteful number, since it uses less digits than its factorization.

9999680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31266 (or 31256 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 9999680 is about 3162.2270633210. The cubic root of 9999680 is about 215.4411709150.

The spelling of 9999680 in words is "nine million, nine hundred ninety-nine thousand, six hundred eighty".