9907720 has 16 divisors (see below), whose sum is σ = 22292460. Its totient is φ = 3963072.

The previous prime is 9907717. The next prime is 9907769. The reversal of 9907720 is 277099.

It can be written as a sum of positive squares in 2 ways, for example, as 9897316 + 10404 = 3146^2 + 102^2 .

It is an Ulam 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, 123807 + ... + 123886.

Almost surely, 2^9907720 is an apocalyptic number.

It is an amenable number.

9907720 is an abundant number, since it is smaller than the sum of its proper divisors (12384740).

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

9907720 is a wasteful number, since it uses less digits than its factorization.

9907720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247704 (or 247700 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 9907720 is about 3147.6530939733. The cubic root of 9907720 is about 214.7787158994.

The spelling of 9907720 in words is "nine million, nine hundred seven thousand, seven hundred twenty".