9961880 has 64 divisors (see below), whose sum is σ = 23639040. Its totient is φ = 3773952.

The previous prime is 9961879. The next prime is 9961907. The reversal of 9961880 is 881699.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78377 + ... + 78503.

It is an arithmetic number, because the mean of its divisors is an integer number (369360).

Almost surely, 2^9961880 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 9961880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11819520).

9961880 is an abundant number, since it is smaller than the sum of its proper divisors (13677160).

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

9961880 is a wasteful number, since it uses less digits than its factorization.

9961880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 9961880 is about 3156.2446039558. The cubic root of 9961880 is about 215.1693635763.

The spelling of 9961880 in words is "nine million, nine hundred sixty-one thousand, eight hundred eighty".