9877661 has 8 divisors (see below), whose sum is σ = 10437120. Its totient is φ = 9332848.

The previous prime is 9877643. The next prime is 9877667. The reversal of 9877661 is 1667789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9877661 - 2²² = 5683357 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9877667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2261 + ... + 4986.

It is an arithmetic number, because the mean of its divisors is an integer number (1304640).

Almost surely, 2^9877661 is an apocalyptic number.

It is an amenable number.

9877661 is a deficient number, since it is larger than the sum of its proper divisors (559459).

9877661 is a wasteful number, since it uses less digits than its factorization.

9877661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7323.

The product of its digits is 127008, while the sum is 44.

The square root of 9877661 is about 3142.8746395617. The cubic root of 9877661 is about 214.5612903824.

The spelling of 9877661 in words is "nine million, eight hundred seventy-seven thousand, six hundred sixty-one".