9877644 has 72 divisors (see below), whose sum is σ = 30051840. Its totient is φ = 2672352.

The previous prime is 9877643. The next prime is 9877667. The reversal of 9877644 is 4467789.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9877644.

It is not an unprimeable number, because it can be changed into a prime (9877643) by changing a digit.

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, 3757 + ... + 5819.

Almost surely, 2^9877644 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 9877644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15025920).

9877644 is an abundant number, since it is smaller than the sum of its proper divisors (20174196).

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

9877644 is a wasteful number, since it uses less digits than its factorization.

9877644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099 (or 2094 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 9877644 is about 3142.8719350301. The cubic root of 9877644 is about 214.5611672918.

The spelling of 9877644 in words is "nine million, eight hundred seventy-seven thousand, six hundred forty-four".