9915660 has 72 divisors (see below), whose sum is σ = 31065216. Its totient is φ = 2557440.

The previous prime is 9915623. The next prime is 9915673. The reversal of 9915660 is 665199.

9915660 is a `hidden beast` number, since 9 + 91 + 566 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4692 + ... + 6468.

Almost surely, 2^9915660 is an apocalyptic number.

9915660 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9915660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15532608).

9915660 is an abundant number, since it is smaller than the sum of its proper divisors (21149556).

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

9915660 is a wasteful number, since it uses less digits than its factorization.

9915660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 9915660 is about 3148.9140985425. The cubic root of 9915660 is about 214.8360747958.

The spelling of 9915660 in words is "nine million, nine hundred fifteen thousand, six hundred sixty".