9661988 has 48 divisors (see below), whose sum is σ = 20388480. Its totient is φ = 3919104.

The previous prime is 9661979. The next prime is 9661991. The reversal of 9661988 is 8891669.

It is a super-2 number, since 2×9661988² = 186708024224288, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 59195 + ... + 59357.

It is an arithmetic number, because the mean of its divisors is an integer number (424760).

Almost surely, 2^9661988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9661988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10194240).

9661988 is an abundant number, since it is smaller than the sum of its proper divisors (10726492).

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

9661988 is a wasteful number, since it uses less digits than its factorization.

9661988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 274 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 9661988 is about 3108.3738513892. The cubic root of 9661988 is about 212.9881777623.

The spelling of 9661988 in words is "nine million, six hundred sixty-one thousand, nine hundred eighty-eight".